Cita APA

Urbanek, A. 1., & Towe, K. M. (1974). Ultrastructural studies on graptofites. Washington: Smithsonian Institution Press.

Citación estilo Chicago

Urbanek, Adam 1928-2014, y Kenneth M. Towe. Ultrastructural Studies On Graptofites. Washington: Smithsonian Institution Press, 1974.

Cita MLA

Urbanek, Adam 1928-2014, y Kenneth M. Towe. Ultrastructural Studies On Graptofites. Washington: Smithsonian Institution Press, 1974.