MLA

of the Census, United States. Bureau. Louisiana : Minor Civil Divisions / Department of Commerce, Bureau of the Census, 1930. the Bureau, 0AD. https://collections.library.yale.edu/catalog/15811450.

APA, 6th edition

of the Census, U. S. B. (0 C.E.). Louisiana : minor civil divisions / Department of Commerce, Bureau of the Census, 1930. [Maps]. the Bureau, https://collections.library.yale.edu/catalog/15811450.