APA (7th ed.) Citation

Zeigler, R., & Porreca, H. C. (1969). Olive shells of the world. R. F. Zeigler and H. C. Porreca.

Chicago Style (17th ed.) Citation

Zeigler, Rowland, and Humbert C. Porreca. Olive Shells of the World. New York: R. F. Zeigler and H. C. Porreca, 1969.

MLA (9th ed.) Citation

Zeigler, Rowland, and Humbert C. Porreca. Olive Shells of the World. R. F. Zeigler and H. C. Porreca, 1969.