Schell, R. E. (1975). Developmental psychology today (2nd ed.). Random House.
Lua i Stíl Chicago (17ú heag.)Schell, Robert E. Developmental Psychology Today. 2nd ed. San Diego: Random House, 1975.
Lua MLA (9ú heag.)Schell, Robert E. Developmental Psychology Today. 2nd ed. Random House, 1975.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.