APA (7th ed.) Citation

Richards, H. G., & Shapiro, E. (1963). An invertebrate macrofauna from the Upper Cretaceous of Delaware. [publisher not identified].

Chicago Style (17th ed.) Citation

Richards, Horace Gardiner, and Earl Shapiro. An Invertebrate Macrofauna from the Upper Cretaceous of Delaware. [Newark, Del.]: [publisher not identified], 1963.

MLA (9th ed.) Citation

Richards, Horace Gardiner, and Earl Shapiro. An Invertebrate Macrofauna from the Upper Cretaceous of Delaware. [publisher not identified], 1963.