Aker, G. F., & Smith, R. M. (1970). Handbook of adult education. Macmillan.
Lua i Stíl Chicago (17ú heag.)Aker, George F., agus Robert M. Smith. Handbook of Adult Education. New York: Macmillan, 1970.
Lua MLA (9ú heag.)Aker, George F., agus Robert M. Smith. Handbook of Adult Education. Macmillan, 1970.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.