Newman, B. M., & Newman, P. R. (2011). Life-span development: A psychosocial approach (11th ed., international ed.). Wadsworth Cengage Learning.
Lua i Stíl Chicago (17ú heag.)Newman, Barbara M., agus Phillip R. Newman. Life-span Development: A Psychosocial Approach. 11th ed., international ed. Belmont, CA: Wadsworth Cengage Learning, 2011.
Lua MLA (9ú heag.)Newman, Barbara M., agus Phillip R. Newman. Life-span Development: A Psychosocial Approach. 11th ed., international ed. Wadsworth Cengage Learning, 2011.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.