Tohutoro APA (7th ed.)

Twenhofel, W. H., & Shrock, R. R. (1953). Principles of invertebrate paleontology (2nd ed.). McGraw-Hill.

Tohutoru Kātū Chicago (17th ed.)

Twenhofel, W. H., me Robert Rakes Shrock. Principles of Invertebrate Paleontology. 2nd ed. New York: McGraw-Hill, 1953.

Tohutoro MLA (9th ed.)

Twenhofel, W. H., me Robert Rakes Shrock. Principles of Invertebrate Paleontology. 2nd ed. McGraw-Hill, 1953.