Cite

A map of the State of New York ... including the Turnpike Roads ... By Wm. McGalpin, Oxford, 1808.

MLA

A Map of the State of New York ... Including the Turnpike Roads ... By Wm. McGalpin, Oxford, 1808. 0AD. https://collections.library.yale.edu/catalog/15790075.

APA, 6th edition

A map of the State of New York ... including the Turnpike Roads ... By Wm. McGalpin, Oxford, 1808. (0 C.E.). [Maps]. https://collections.library.yale.edu/catalog/15790075.