APA (7th ed.) Citation

Coghill, W. H., DeVaney, F. D., & Gandrud, B. W. (1929). Gravity concentration of Alabama oolitic iron ores. [publisher not identified].

Chicago Style (17th ed.) Citation

Coghill, Will H., Fred Daniel DeVaney, and Bennie William Gandrud. Gravity Concentration of Alabama Oolitic Iron Ores. Washington, D.C.: [publisher not identified], 1929.

MLA (9th ed.) Citation

Coghill, Will H., et al. Gravity Concentration of Alabama Oolitic Iron Ores. [publisher not identified], 1929.