Cita APA

Shrock, R. R., & Twenhofel, W. (1953). Principles of invertebrate paleontology McGraw-Hill.

Citación estilo Chicago

Shrock, Robert R., and William Twenhofel. Principles of Invertebrate Paleontology. 2. ed. New York: McGraw-Hill, 1953.

Cita MLA

Shrock, Robert R., and William Twenhofel. Principles of Invertebrate Paleontology. 2. ed. New York: McGraw-Hill, 1953.