APA (7th ed.) Citation

Twenhofel, W. H., & Shrock, R. R. (1953). Invertebrata paleontology. McGraw Hill.

Chicago Style (17th ed.) Citation

Twenhofel, William H., and Robert R. Shrock. Invertebrata Paleontology. McGraw Hill, 1953.

MLA (8th ed.) Citation

Twenhofel, William H., and Robert R. Shrock. Invertebrata Paleontology. McGraw Hill, 1953.

Warning: These citations may not always be 100% accurate.