APA (7th ed.) Citation

Behrens, H. (1949). Treasures of Mexico. [publisher not identified].

Chicago Style (17th ed.) Citation

Behrens, Helen. Treasures of Mexico. Mexico, D.F.: [publisher not identified], 1949.

MLA (8th ed.) Citation

Behrens, Helen. Treasures of Mexico. [publisher not identified], 1949.