Bossing, N. L. (1944). Progressive methods of teaching in secondary school. Houghton Mifflin.
Citace podle Chicago (17th ed.)Bossing, Nelson L. Progressive Methods of Teaching in Secondary School. Houghton Mifflin, 1944.
Citace podle MLA (9th ed.)Bossing, Nelson L. Progressive Methods of Teaching in Secondary School. Houghton Mifflin, 1944.
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