Bell, C. K., Keefe, R. F., & Fried, J. S. (2017). OpCost: An open-source system for estimating costs of stand-level forest operations. United States Department of Agriculture, Forest Service, Pacific Northwest Research Station.
Chicago Style (17th ed.) CitationBell, Conor K., Robert F. Keefe, and Jeremy Steven Fried. OpCost: An Open-source System for Estimating Costs of Stand-level Forest Operations. Portland, OR: United States Department of Agriculture, Forest Service, Pacific Northwest Research Station, 2017.
MLA (9th ed.) CitationBell, Conor K., et al. OpCost: An Open-source System for Estimating Costs of Stand-level Forest Operations. United States Department of Agriculture, Forest Service, Pacific Northwest Research Station, 2017.
Warning: These citations may not always be 100% accurate.