APA (7th ed.) Citation

Chicago Academy of Sciences. [from old catalog], Ball, J. R. 1. [. o. c., & Greacen, K. F. 1. [. o. c. (1946). Catalog of the Egan collection of Silurian invertebrate fossils at the Chicago Academy of Sciences. The Chicago Academy of Sciences.

Chicago Style (17th ed.) Citation

Chicago Academy of Sciences. [from old catalog], John Rice 1881- [from old catalog] Ball, and Katherine Fielding 1913- [from old catalog] Greacen. Catalog of the Egan Collection of Silurian Invertebrate Fossils at the Chicago Academy of Sciences. Chicago: The Chicago Academy of Sciences, 1946.

MLA (9th ed.) Citation

Chicago Academy of Sciences. [from old catalog], et al. Catalog of the Egan Collection of Silurian Invertebrate Fossils at the Chicago Academy of Sciences. The Chicago Academy of Sciences, 1946.