Sources differ regarding Sarah's surname (n.b., either HILL or HUBB could be a mis-reading of the other in an old document).

1a.  Anon.  1898/1899.  "Marriage Bonds in Goochland County..."  Pages 185-203 in (1984) Virginia Vital Records...  Genealogical Publ. Co., Baltimore, MD (Broderbund CD-174):

p. 180	October 11, 1755.  Thomas Riddle to Agnes Mims; sec., Wm. Robards; witn., Valentine Wood; certificate of consent from David Mims; witn., Hezekiah Puryear and Drury Mims.
p. 188	December 24, 1757. William Robards to Elizabeth Lewis; sec., George Payne; witn. Val. Wood; certificate of consent of Joseph Lewis, father of Elizabeth; witn., Wm. Lewis, James Cocke, John Lewis.  [This Lewis family came originally from Henrico county.  Lewis Robards, one of the fruits of this marriage, married Rachel Donelson, who married, secondly, President Andrew Jackson.]
p. 190	February 12, 1762.  Thomas Poindexter to Elizabeth Pledge, daughter of Wm. Pledge; sec., Wm. Robards; William Pledge's letter of consent.
p. 191	April 26, 1769.  Robert Mosby to Anne Lewis, daughter of Joseph Lewis; sec. William Robards. Joseph Lewis' letter of consent.

1b.  Lyon G. Tucker.  1906/7.  "Register of St. James Northam Parish, Goochland County...."  Pages 108-137 in (1984) Virginia Vital Records... Genealogical Publ. Co., Baltimore, MD (Broderbund CD-174):

p. 108	REGISTER OF ST. JAMES NORTHAM PARISH, GOOCHLAND COUNTY. (This register, which was kept by Rev. William Douglas, is the property of R. Lee Traylor, Esq., of Memphis, Tennessee, and the following notes were taken by me from his very full manuscript:)...
p. 109	MARRIAGES...
p. 110	1754, Jan. 5. William Roberts and Eliz Lewis, both in this parish.
p. 118	BIRTHS...
p. 120	William Roberts & Eliz. Lewis, Jesse b. Apl 7, 1762.
p. 122	Will Robards and Eliz. Lewis, Sally, b. Jan. 25, 1765.
p. 128	Will Robards and Eliz. Lewis, son Robert, Dec. 7, 1773.

The year 1754 has to be a misreading of 1758 because the bond was posted 24 Dec 1757 and because William's previous wife didn't die until Sep 1756.

.  William H. Dumont.  1958.  "A Short Census of Virginia — 1779."  National Genealogical Society Quarterly 46(4): 163-211 (Broderbund CD-210):

p. 166	TABLE 3
		County	Entry No.	Amount Deposited
p. 199	Robards, James	Goo.	2378	228
	Robards, William	Goo.	2878	163

These are the only ROBARDS/ROBERDS in this census.

.  Census Index:  Colonial America, 1607-1789 (Broderbund CD-310):

1779	Robards, William	VA	Goochland Co.
1779	Robards, James	VA	Goochland Co.

Obviously the same original source as the previous one.  The only other ROBARDS/ROBERDS in Virginia on this CD is John ROBERDS on the 1783 tax list of Amherst Co.

.  Census Index:  U.S. Selected Counties, 1790 (Broderbund CD-311):  the VA census was destroyed.

.  Anon.  1991.  The 1795 Census of Kentucky [as constructed from tax lists].  T.L.C. Genealogy, Miami Beach, FL (said to include every extant tax list from the state of Kentucky for the year 1795):

Pg	Name	County
148	Robards, Elizaeth	Mercer

Also in Mercer Co.:  George, Jessy, Joseph and William S. ROBARDS plus Lewis ROBERDS.  Also in Kentucky: John ROBERDS in Campbell Co., Morning and William ROBERDS in Madison Co., and William ROBERDS in Scott Co.

.  Census Index:  U.S. Selected Counties, 1800 (Broderbund CD-312):  the VA and KY censuses were destroyed, but tax lists are substituted for some KY counties:

1800 Tax List

Robards, Elizabeth

KY

Mercer Co.

The only other ROBARDS in Kentucky were her sons Jesse and George, also in Mercer Co.

.  W. Mac Jones. 1927. "Index to Goochland County Wills, Etc., L to W."  Pages 133-143 in (1993) Virginia Will Records... Genealogical Publ. Co., Baltimore, MD (Broderbund CD-174):

p. 138

Robards, William (W), D.B. 13, p. 347, 15 Dec., 1783.

"(W)" = Will.

.  John Lewis Robards.  1900-1903 [1981].  The Robards Family.  Pages 128-132 in Genealogies of Virginia Families: from the Virginia Magazine of History and Biography.  Genealogical Publ. Co., Baltimore, MD (Broderbund CD-162).

.  James Harvey Robards.  1910.  History and Genealogy of the RoBards Family.  Self-published, Whiteland, Indiana (photocopy courtesy of Gerald Lawrence; transcription by Diana Gale Matthiesen).

.  Norma Carter Miller & George Lane Miller.  1980. Pleasants and Allied Families: an Historical Genealogy of the Descendants of John Pleasants (1644/5-1698) of Henrico County, Virginia, and of George Pleasant of York County, Virginia.  Self-published, DeKalb, Ill.  [not seen, but cited by others]

.  William Armstrong Crozier.  1907.  The Buckners of Virginia and the Allied Families of Strother and Ashby.  The Genealogical Association, NY.  [not seen, but cited by others]

.  LDS.  Family Search: Internet Genealogy Service:  AF - Ancestral File (online at FamilySearch.org).

.  WorldConnect / Ancestry World Trees (online at RootsWeb.com/Ancestry.com).

.  Messages in the Robards Family Genealogy Forum (online at GenForum.com).