(1977). Birds protected in Canada under the Migratory Birds Convention Act. Canadian widlife service.
Cita Chicago Style (17a ed.)Birds Protected in Canada Under the Migratory Birds Convention Act. Ottawa: Canadian widlife service, 1977.
Cita MLA (9a ed.)Birds Protected in Canada Under the Migratory Birds Convention Act. Canadian widlife service, 1977.
Precaución: Estas citas no son 100% exactas.