APA (7th ed.) Citation

Popenoe, W. P., & Saul, L. R. (1987). Evolution and classification of the late Cretaceous-early Tertiary gastropod perissitys. Natural History Museum.

Chicago Style (17th ed.) Citation

Popenoe, W. P., and L. R. Saul. Evolution and Classification of the Late Cretaceous-early Tertiary Gastropod Perissitys. Los Angeles, Calif: Natural History Museum, 1987.

MLA (9th ed.) Citation

Popenoe, W. P., and L. R. Saul. Evolution and Classification of the Late Cretaceous-early Tertiary Gastropod Perissitys. Natural History Museum, 1987.