APA (7th ed.) Citation

Heigold, P. C., McGinnis, L. D., & Howard, R. H. (1964). Geologic significance of the gravity field in the DeWitt-McLean County areas, Illinois. [publisher not identified].

Chicago Style (17th ed.) Citation

Heigold, Paul C., Lyle David McGinnis, and Richard Henry Howard. Geologic Significance of the Gravity Field in the DeWitt-McLean County Areas, Illinois. Urbana: [publisher not identified], 1964.

MLA (9th ed.) Citation

Heigold, Paul C., et al. Geologic Significance of the Gravity Field in the DeWitt-McLean County Areas, Illinois. [publisher not identified], 1964.