Morton, M. L. (2002). The mountain white crowned sparrow: Migration and reproduction at high altitude. Cooper Ornithological Society.
Lua i Stíl Chicago (17ú heag.)Morton, Martin L. The Mountain White Crowned Sparrow: Migration and Reproduction at High Altitude. Camarillo: Cooper Ornithological Society, 2002.
Lua MLA (9ú heag.)Morton, Martin L. The Mountain White Crowned Sparrow: Migration and Reproduction at High Altitude. Cooper Ornithological Society, 2002.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.