Official road map of Louisiana / compiled and drawn by Hal M. Bourg, 1936 ; compliments of Louisiana Highway Commission.
MLA
Bourg, Hal M. Official Road Map of Louisiana / Compiled and Drawn by Hal M. Bourg, 1936 ; Compliments of Louisiana Highway Commission. Louisiana Highway Commission, 1937. https://collections.library.yale.edu/catalog/15811460.
APA, 6th edition
Bourg, H. M. (1937). Official road map of Louisiana / compiled and drawn by Hal M. Bourg, 1936 ; compliments of Louisiana Highway Commission. [Road maps]. Louisiana Highway Commission, https://collections.library.yale.edu/catalog/15811460.