1.  Gary Boyd Roberts.  1995.  Ancestors of American Presidents.  New England Historic Genealogical Society, Boston, p. 26.

2.  Amos Canfield.  1934.  Abstracts of Early Wills of Queens County, New York, Recorded in Libers A and C of Deeds, Now in the Register's Office at Jamaica, New York.  New York Genealogical and Biographical Record.  Vol. LXV, pp. 114-120.  (Republ. 1987 as pp. 127-133 in Long Island Source Records. Genealogical Publ. Co., Baltimore.)  On p. 127:

Messenger, Samuel, of Jamaica, 20 Dec., 1685.  House & home lot to oldest son, Samuel.  To my three other sons, Andrew, Samuel (sic), & John meadows & goods.  Goods & five acres I bought of Zachariah Mills to daus. Alice & Susannah.  Wife Susannah exx.  Overseers: Zachariah Mills, Jonas Wood, Richard Jones, & Benjamin Jones.  Wits: Richard Jones & Jonas Wood.  Pro. 2d Tuesday in March, 1685.

3.  Timothy Hopkins.  1932.  John Hopkins of Cambridge, Massachusetts, 1634, and Some of His Descendants.  Stanford Univ. Press, Stanford, CA, p. 44.  As a footnote on p. 44:

Daniel [Messenger] was the son of Samuel and Susanna (Mills) Messenger of Jamaica, Long Island; his grandfather, Andrew Messenger...

4.  A big thank you to Allan Gilbertson for emailing me this message:

See Helen S. Ullman, "The Three Messengers: Henry, Andrew and Edward: Clearing the Decks", New England Historical and Genealogical Register, Vol. 152 (July 1998), p. 362.  She states: "In spite of what has appeared in print in numerous places, her maiden name was probably not Mills." When he referred in deeds and in his will to Zachariah Mills as his brother, he was referring to the fact that Zachariah was the husband of Samuel's sister Abigail.

5.  Allan Gilbertson's Genealogy Page [link died] — excellent site.  Allan's work is well documented.

6.  Ancestry World Trees (online at Ancestry.com).