United States. Forest Service. North Pacific Region. Public Relations Office. (1932). What is forestry?: An outline for classes in economics, geography and nature study in high schools of Washington.
Chicago Style (17th ed.) CitationUnited States. Forest Service. North Pacific Region. Public Relations Office. What Is Forestry?: An Outline for Classes in Economics, Geography and Nature Study in High Schools of Washington. Portland, 1932.
MLA引文United States. Forest Service. North Pacific Region. Public Relations Office. What Is Forestry?: An Outline for Classes in Economics, Geography and Nature Study in High Schools of Washington. 1932.
警告：這些引文格式不一定是100％准確.