Pearson, T. g. (1936). Birds Of America. Garden city books.
Lua i Stíl Chicago (17ú heag.)Pearson, T. gilbert. Birds Of America. Garden city books, 1936.
Lua MLA (8ú heag.)Pearson, T. gilbert. Birds Of America. Garden city books, 1936.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.