APA (7th ed.) Citation

Pan American Union. (1940). The Pan American book shelf, volume 3, number 5, May 1940. [s.n.].

Chicago Style (17th ed.) Citation

Pan American Union. The Pan American Book Shelf, Volume 3, Number 5, May 1940. [Washington]: [s.n.], 1940.

MLA (9th ed.) Citation

Pan American Union. The Pan American Book Shelf, Volume 3, Number 5, May 1940. [s.n.], 1940.