Leonard, W. P. (1993). Amphibians of Washington and Oregon. Seattle Audubon Society.
Cita Chicago Style (17a ed.)Leonard, W. P. Amphibians of Washington and Oregon. Seattle, Wash.: Seattle Audubon Society, 1993.
Cita MLA (8a ed.)Leonard, W. P. Amphibians of Washington and Oregon. Seattle Audubon Society, 1993.
Precaución: Estas citas no son 100% exactas.