A map of the British empire in North America / by Samuel Dunn, mathematician.
MLA
A Map of the British Empire in North America / by Samuel Dunn, Mathematician. Printed for R. Sayer, 1774. https://collections.library.yale.edu/catalog/15830731.
APA, 6th edition
A map of the British empire in North America / by Samuel Dunn, mathematician. (1774). [Maps]. Printed for R. Sayer, https://collections.library.yale.edu/catalog/15830731.