Feibleman, P. S. (1973). The Columbus tree ([1st ed.].). Atheneum.
Lua i Stíl Chicago (17ú heag.)Feibleman, Peter S. The Columbus Tree. [1st ed.]. New York: Atheneum, 1973.
Lua MLA (9ú heag.)Feibleman, Peter S. The Columbus Tree. [1st ed.]. Atheneum, 1973.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.