Phi Delta Kappa. Commission on Lifelong Learning & Overly, N. V. (1980). A Model for lifelong learning. Phi Delta Kappa.
Lua i Stíl Chicago (17ú heag.)Phi Delta Kappa. Commission on Lifelong Learning agus Norman V. Overly. A Model for Lifelong Learning. Bloomington, Ind.: Phi Delta Kappa, 1980.
Lua MLA (8ú heag.)Phi Delta Kappa. Commission on Lifelong Learning agus Norman V. Overly. A Model for Lifelong Learning. Phi Delta Kappa, 1980.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.