Guppy, C. S., & Shepard, J. (2001). Butterflies of British Columbia: Including western Alberta, southern Yukon, the Alaska Panhandle, Washington, northern Oregon, northern Idaho, northwestern Montana. UBC Press.
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Cita Chicago Style (17a ed.)
Guppy, Crispin Spencer, y Jon Shepard. Butterflies of British Columbia: Including Western Alberta, Southern Yukon, the Alaska Panhandle, Washington, Northern Oregon, Northern Idaho, Northwestern Montana. Vancouver: UBC Press, 2001.
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Cita MLA (9a ed.)
Guppy, Crispin Spencer, y Jon Shepard. Butterflies of British Columbia: Including Western Alberta, Southern Yukon, the Alaska Panhandle, Washington, Northern Oregon, Northern Idaho, Northwestern Montana. UBC Press, 2001.
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