↑ "Records of the Society of Friends of the City of New York and Vicinity, from 1640 to 1800", in The New York Genealogical and Biographical Record. (New York, New York: New York Genealogical and Biographical Society) Vol. 4, p. 36.
The children of Henery and Mary Cock, of Mattinicok: ... Mary Cock born ye 8'd of 8 m., 1711. [Note: In old-styles dates, the eighth month is October. More info may be found here.]