1a.  Jordan R. Dodd, ed.  1993.  Kentucky Marriages:  Early to 1850.  Liahona Research, Orem, UT (Broderbund CD-229):

James, Robert

Cole, Zarilda

Dec 28, 1841

Scott Co.

1b.  Jordan R. Dodd, ed.  1998.  Marriage Index: Missouri, 1851-1900.  Liahona Research, Orem, UT (Broderbund CD-234):

Simms, Benjamin

James, Mrs. Zerilda

30 Sep 1852

Clay Co.

2.  1850 Census Every-Name-Index/Images (online at Ancestry.com; Image #7 of 20):  Platt Twp., Clay Co., MO, Roll M432_396, p. 351B, 732/732, enumerated 28 Sep 1850, official enumeration date 1 Jun 1850 (extracted by Diana Gale Matthiesen):

James Robert	31	M		B.P. Preacher	2100	Ky
"   Sarelda	28	F				do
"   Franklin	10	M				Mo
"   Jesse R	4	M				do
"   Susan	9/12	F				do

Some say Robert died 18 Aug 1850 and others say he died 19 Aug 1851.  Although the census was enumerated on 28 Sep 1850, which would seem to rule out the earlier date, the official enumeration date was 1 Jun 1850, so if Robert was alive on that date, he would be shown in the census.  The later date is still more probable because it would have been a very fast trip to make it to California that fast.

3.  1860 Census Index/Images (online at Ancestry.com, Image #16 of 41):  Missouri City P.O., Washington Twp., Clay Co., MO, Roll M653_614, p. 969, PN 133, 920/920, enumerated 26 Jun 1860, official enumeration date 1 Jun 1860 (extracted by Diana Gale Matthiesen):

Reuben Samuel	33	M		Farmer	5000	6025	Ky
Zarilda   "	35	F					do
Alexander James	16	M					Mo
Jesse W     "	12	M					do
Susan L     "	10	F					do
Sarah Samuel	1	F					do

4.  1870 Census Every-Name-Index/Images (online at Ancestry.com, Image #31-32 of 56):  Liberty P.O., Washington Twp., Clay Co., MO, Roll M432_396, pp. 829A-829B, PN 31-32, 233/233, enumerated 20 Aug 1870, official enumeration date 1 Jun 1870 (extracted by Diana Gale Matthiesen):

Samuel Reuben	92	M	W	Farmer	10,000	1500	Ky
______ Serelda	45	F	W	Keeping House			"
______ Sarah E	11	F	W	at Home			Mo
______ Jno F	9	M	W	"			"
______ Finnie Q	6	F	W	"			"
______ Archie M	4	M	W	"			"
______ Mary	2	F	W	"			"
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James Susan	20	F	W	at Home			Mo

5.  Broderbund.  World Family Trees.  Vol. 11, Pedigree No. 4556.

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