APA (7th ed.) Citation

Agar, W. M., Flint, R. F., & Longwell, C. R. (1929). Geology from original sources: Organized collateral readings for students in general geology. H. Holt and company.

Chicago Style (17th ed.) Citation

Agar, William Macdonough, Richard Foster Flint, and Chester R. Longwell. Geology from Original Sources: Organized Collateral Readings for Students in General Geology. New York: H. Holt and company, 1929.

MLA (9th ed.) Citation

Agar, William Macdonough, et al. Geology from Original Sources: Organized Collateral Readings for Students in General Geology. H. Holt and company, 1929.