Johnson, C. G. (1998). Common plants of the inland Pacific Northwest. USDA Forest Service, Pacific Northwest Region.
Style de citation Chicago (17e éd.)Johnson, Charles G. Common Plants of the Inland Pacific Northwest. [Portland, Or.]: USDA Forest Service, Pacific Northwest Region, 1998.
Style de citation MLA (8e éd.)Johnson, Charles G. Common Plants of the Inland Pacific Northwest. USDA Forest Service, Pacific Northwest Region, 1998.
Attention : ces citations peuvent ne pas être correctes à 100%.