MLA

Barlow, Inigo, and printmaker. Plan of the Principal Floor [Graphic] ; Ground Plan of the Offices. Printed by Thomas Kirgate, 0AD. https://collections.library.yale.edu/catalog/16850849.

APA, 6th edition

Barlow, I., & printmaker. (0 C.E.). Plan of the principal floor [graphic] ; Ground plan of the offices [Floor plans, Book illustrations, Etchings England London 1784]. Printed by Thomas Kirgate. https://collections.library.yale.edu/catalog/16850849.