Phelps, E., Strang, R. M., & Withrow, D. (1966). Gateways to readable books: An annotated graded list of books in many fields for adolescents who find reading difficult (4th ed.). H. W. Wilson.
Lua i Stíl Chicago (17ú heag.)Phelps, Ethlyne, Ruth May Strang, agus Dorothy Withrow. Gateways to Readable Books: An Annotated Graded List of Books in Many Fields for Adolescents Who Find Reading Difficult. 4th ed. New York: H. W. Wilson, 1966.
Lua MLA (9ú heag.)Phelps, Ethlyne, et al. Gateways to Readable Books: An Annotated Graded List of Books in Many Fields for Adolescents Who Find Reading Difficult. 4th ed. H. W. Wilson, 1966.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.