APA (7th ed.) Citation

English, R. M., & Grogan, R. M. (1948). Omaha pool and mica-periodotite intrusives, Gallatin County, Illinois. [publisher not identified].

Chicago Style (17th ed.) Citation

English, R. M., and Robert Mann Grogan. Omaha Pool and Mica-periodotite Intrusives, Gallatin County, Illinois. Urbana: [publisher not identified], 1948.

MLA (9th ed.) Citation

English, R. M., and Robert Mann Grogan. Omaha Pool and Mica-periodotite Intrusives, Gallatin County, Illinois. [publisher not identified], 1948.