Cita APA

Kier, P. M., & Kier, P. M. (1972). Tertiary and mesozoic echinoids of Saudi Arabia. Washington: Smithsonian Institution Press.

Citación estilo Chicago

Kier, Porter M., y Porter M. Kier. Tertiary and Mesozoic Echinoids of Saudi Arabia. Washington: Smithsonian Institution Press, 1972.

Cita MLA

Kier, Porter M., y Porter M. Kier. Tertiary and Mesozoic Echinoids of Saudi Arabia. Washington: Smithsonian Institution Press, 1972.