APA-čujuhus (7. p.)
Steen, H. K. (2004). The U.S. Forest Service: A history (Centennial edition.). Forest History Society : University of Washington Press.
Chicago-čujuhus (17. p.)
Steen, Harold K. The U.S. Forest Service: A History. Centennial edition. Durham, North Carolina ; Seattle, Washington: Forest History Society : University of Washington Press, 2004.
MLA-čujuhus (9. p.)
Steen, Harold K. The U.S. Forest Service: A History. Centennial edition. Forest History Society : University of Washington Press, 2004.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.