Perlmutter, M., & Hall, E. (1992). Adult development and aging (2nd.ed.). John Wiley & Sons.
Lua i Stíl Chicago (17ú heag.)Perlmutter, Marion, agus Elizabeth Hall. Adult Development and Aging. 2nd.ed. New York: John Wiley & Sons, 1992.
Lua MLA (9ú heag.)Perlmutter, Marion, agus Elizabeth Hall. Adult Development and Aging. 2nd.ed. John Wiley & Sons, 1992.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.