Mussen, P. (1973). The psychological development of the child (2nd ed.). Prentice - hall.
Lua i Stíl Chicago (17ú heag.)Mussen, Paul. The Psychological Development of the Child. 2nd ed. New Jersey: Prentice - hall, 1973.
Lua MLA (9ú heag.)Mussen, Paul. The Psychological Development of the Child. 2nd ed. Prentice - hall, 1973.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.