United States. Forest Service, Calkins, H. A., & Yule, J. B. (1927). Abney level handbook. U.S. GPO.
Chicago Style (17th ed.) CitationUnited States. Forest Service, H. A. Calkins, and J. B. Yule. Abney Level Handbook. Washington: U.S. GPO, 1927.
MLA (9th ed.) CitationUnited States. Forest Service, et al. Abney Level Handbook. U.S. GPO, 1927.
Warning: These citations may not always be 100% accurate.