Caldwell, I. S. (1959). The organizing principle in the curriculum of Christian education: Protestant trends.
Chicago-viite (17. p.)Caldwell, Irene Smith. The Organizing Principle in the Curriculum of Christian Education: Protestant Trends. 1959.
MLA-viite (8. p.)Caldwell, Irene Smith. The Organizing Principle in the Curriculum of Christian Education: Protestant Trends. 1959.
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