Le Roy, B. (1968). Northwest forts and trading posts. Washington State Historical Society.
Style de citation Chicago (17e éd.)Le Roy, Bruce. Northwest Forts and Trading Posts. Tacoma: Washington State Historical Society, 1968.
Style de citation MLA (8e éd.)Le Roy, Bruce. Northwest Forts and Trading Posts. Washington State Historical Society, 1968.
Attention : ces citations peuvent ne pas être correctes à 100%.