APA (7th ed.) Citation

Bethmann, E. W. (1960). Yemen on the threshold. American Friends of the Middle East.

Chicago Style (17th ed.) Citation

Bethmann, Erich W. Yemen on the Threshold. Washington, D.C.: American Friends of the Middle East, 1960.

MLA (9th ed.) Citation

Bethmann, Erich W. Yemen on the Threshold. American Friends of the Middle East, 1960.