Gage, N. L. (1984). Educational psychology (3rd ed.). Houghton Mifflin.
Lua i Stíl Chicago (17ú heag.)Gage, N. L. Educational Psychology. 3rd ed. Boston: Houghton Mifflin, 1984.
Lua MLA (9ú heag.)Gage, N. L. Educational Psychology. 3rd ed. Houghton Mifflin, 1984.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.