APA (7th ed.) Citation
Twenhofel, W. H., & Shrock, R. R. ;. (1953). Principles of invertebrate paleontology (2d ed.). McGraw-Hill.
Chicago Style (17th ed.) Citation
Twenhofel, William Henry, and Robert Rakes Shrock. Principles of Invertebrate Paleontology. 2d ed. New York: McGraw-Hill, 1953.
MLA (9th ed.) Citation
Twenhofel, William Henry, and Robert Rakes Shrock. Principles of Invertebrate Paleontology. 2d ed. McGraw-Hill, 1953.
Warning: These citations may not always be 100% accurate.