United States. Forest Service. (1989). Northern Region: Summer of '88. Forest Service, US Dept. of Agriculture.
Style de citation Chicago (17e éd.)United States. Forest Service. Northern Region: Summer of '88. [Missoula, Mont.?]: Forest Service, US Dept. of Agriculture, 1989.
Style de citation MLA (8e éd.)United States. Forest Service. Northern Region: Summer of '88. Forest Service, US Dept. of Agriculture, 1989.
Attention : ces citations peuvent ne pas être correctes à 100%.