APA (7th ed.) Citation

(1940). The Pan American book shelf, volume 3, number 6, June 1940. [s.n.].

Chicago Style (17th ed.) Citation

The Pan American Book Shelf, Volume 3, Number 6, June 1940. [Washington]: [s.n.], 1940.

MLA (9th ed.) Citation

The Pan American Book Shelf, Volume 3, Number 6, June 1940. [s.n.], 1940.