Barnes, D. L. (1966). Psychological considerations in religious education. Ball State University.
Lua i Stíl Chicago (17ú heag.)Barnes, Donald L. Psychological Considerations in Religious Education. Muncie, Ind.: Ball State University, 1966.
Lua MLA (8ú heag.)Barnes, Donald L. Psychological Considerations in Religious Education. Ball State University, 1966.
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