Não informado. (1945). Station paper. U.S. Lake States Forest Experiment Station.
Chicago-Zitierstil (17. Ausg.)Não informado. Station Paper. Washington: U.S. Lake States Forest Experiment Station, 1945.
MLA-Zitierstil (8. Ausg.)Não informado. Station Paper. U.S. Lake States Forest Experiment Station, 1945.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.