Bossing, N. L. (1944). Progressive methods of teaching in secondary school. Houghton Mifflin.
Čikaški stil citiranja (17. izdanje)Bossing, Nelson L. Progressive Methods of Teaching in Secondary School. Houghton Mifflin, 1944.
MLA način citiranja (9. izdanje)Bossing, Nelson L. Progressive Methods of Teaching in Secondary School. Houghton Mifflin, 1944.
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