APA (7th ed.) Citation

Pyle, R. M. (1974). Watching Washington butterflies: An interpretive guide to the State's 134 species, including most of the butterflies of Oregon, Idaho, and British Columbia. Seattle Audubon Society.

Chicago Style (17th ed.) Citation

Pyle, Robert Michael. Watching Washington Butterflies: An Interpretive Guide to the State's 134 Species, Including Most of the Butterflies of Oregon, Idaho, and British Columbia. [Seattle]: Seattle Audubon Society, 1974.

MLA (8th ed.) Citation

Pyle, Robert Michael. Watching Washington Butterflies: An Interpretive Guide to the State's 134 Species, Including Most of the Butterflies of Oregon, Idaho, and British Columbia. Seattle Audubon Society, 1974.

Warning: These citations may not always be 100% accurate.