APA (7th ed.) Citation

United States. Forest Service, Calkins, H. A., & Yule, J. B. (1927). Abney level handbook. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Forest Service, H. A. Calkins, and J. B. Yule. Abney Level Handbook. Washington: U.S. GPO, 1927.

MLA (9th ed.) Citation

United States. Forest Service, et al. Abney Level Handbook. U.S. GPO, 1927.