Schneider, E., & Vriends, M. M. (1988). Parakeets. T.F.H. Publications.
Lua i Stíl Chicago (17ú heag.)Schneider, Earl, agus Matthew M. Vriends. Parakeets. Neptune City, NJ: T.F.H. Publications, 1988.
Lua MLA (9ú heag.)Schneider, Earl, agus Matthew M. Vriends. Parakeets. T.F.H. Publications, 1988.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.