Philipson, W. R. (1948). Birds of a valley. Longmans, Green.
Lua i Stíl Chicago (17ú heag.)Philipson, W. R. Birds of a Valley. London, New York: Longmans, Green, 1948.
Lua MLA (8ú heag.)Philipson, W. R. Birds of a Valley. Longmans, Green, 1948.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.