APA (7th ed.) Citation

Alway, F. J., Files, E. K., & Pinckney, R. M. (1910). The determination of humus.

Chicago Style (17th ed.) Citation

Alway, F. J., E. K. Files, and R. M. Pinckney. The Determination of Humus. Lincoln, 1910.

MLA (9th ed.) Citation

Alway, F. J., et al. The Determination of Humus. 1910.