Não informado. (1963). US Forest Service Research Paper PNW. U.S. Forest Service.
Chicagoスタイル(17版)引用形式Não informado. US Forest Service Research Paper PNW. Portland, Ore: U.S. Forest Service, 1963.
MLA(8版)引用形式Não informado. US Forest Service Research Paper PNW. U.S. Forest Service, 1963.
警告: この引用は必ずしも正確ではありません.