Beck, S. D. Animal photoperiodism.
Lua i Stíl Chicago (17ú heag.)Beck, Stanley D. Animal Photoperiodism.
Lua MLA (8ú heag.)Beck, Stanley D. Animal Photoperiodism.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.
Lua APA (7ú heag.)