Cita APA (7a ed.)

Westermann, G. E. G., & Riccardi, A. C. (1980). The Upper Bajocian ammonite Strenoceras in Chile: First circum-Pacific record of the subfurcatum Zone.

Cita Chicago Style (17a ed.)

Westermann, G. E. G., y Alberto Carlos Riccardi. The Upper Bajocian Ammonite Strenoceras in Chile: First Circum-Pacific Record of the Subfurcatum Zone. 1980.

Cita MLA (8a ed.)

Westermann, G. E. G., y Alberto Carlos Riccardi. The Upper Bajocian Ammonite Strenoceras in Chile: First Circum-Pacific Record of the Subfurcatum Zone. 1980.