Phi Delta Kappa. Commission on Lifelong Learning & Overly, N. V. (1980). A Model for lifelong learning. Phi Delta Kappa.
Citace podle Chicago (17th ed.)Phi Delta Kappa. Commission on Lifelong Learning a Norman V. Overly. A Model for Lifelong Learning. Bloomington, Ind.: Phi Delta Kappa, 1980.
Citace podle MLA (8th ed.)Phi Delta Kappa. Commission on Lifelong Learning a Norman V. Overly. A Model for Lifelong Learning. Phi Delta Kappa, 1980.
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