MLA

Kirkwood, James Pugh, 1807-1877. Experimental survey for a railroad between New Haven & Humphreysville, forming part of the line to Waterbury / made in July 1847 by J.P. Kirkwood.. BRBL_00712. [1847]. https://collections.library.yale.edu/catalog/15830187.

APA, 6th edition

Kirkwood, James Pugh, 1807-1877. (["BRBL_00712"])([1847])[Experimental survey for a railroad between New Haven & Humphreysville, forming part of the line to Waterbury / made in July 1847 by J.P. Kirkwood.]. https://collections.library.yale.edu/catalog/15830187.