Bossing, N. L. (1942). Progressive methods of teaching in secondary schools (Rev. ed.). Houghton Mifflin Company.
Citace podle Chicago (17th ed.)Bossing, Nelson L. Progressive Methods of Teaching in Secondary Schools. Rev. ed. Boston, New York [etc.]: Houghton Mifflin Company, 1942.
Citace podle MLA (8th ed.)Bossing, Nelson L. Progressive Methods of Teaching in Secondary Schools. Rev. ed. Houghton Mifflin Company, 1942.
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