APA (7th ed.) Citation

Beerbower, James R., & Boyer, R. E. (1971). Field guide to fossils. Houghton Mifflin.

Chicago Style (17th ed.) Citation

Beerbower, James R., and Robert E. Boyer. Field Guide to Fossils. Boston: Houghton Mifflin, 1971.

MLA (9th ed.) Citation

Beerbower, James R., and Robert E. Boyer. Field Guide to Fossils. Houghton Mifflin, 1971.