APA (7th ed.) Citation

Haenggi, W. T. (1966). Geology of El Cuervo area, northeastern Chihuahua, Mexico. [publisher not identified].

Chicago Style (17th ed.) Citation

Haenggi, Walter Tiffany. Geology of El Cuervo Area, Northeastern Chihuahua, Mexico. [Place of publication not identified]: [publisher not identified], 1966.

MLA (9th ed.) Citation

Haenggi, Walter Tiffany. Geology of El Cuervo Area, Northeastern Chihuahua, Mexico. [publisher not identified], 1966.