APA (7th ed.) Citation

Gibbs, P. (1938). Across the frontiers. Book League of America.

Chicago Style (17th ed.) Citation

Gibbs, Philip. Across the Frontiers. New York: Book League of America, 1938.

MLA (9th ed.) Citation

Gibbs, Philip. Across the Frontiers. Book League of America, 1938.

Warning: These citations may not always be 100% accurate.