APA-referens (7:e uppl.)

Bossing, N. L. (1942). Progressive methods of teaching in secondary schools (Rev. ed.). Houghton Mifflin Company.

Chicago-referens (17:e uppl.)

Bossing, Nelson L. Progressive Methods of Teaching in Secondary Schools. Rev. ed. Boston, New York [etc.]: Houghton Mifflin Company, 1942.

MLA-referens (8:e uppl.)

Bossing, Nelson L. Progressive Methods of Teaching in Secondary Schools. Rev. ed. Houghton Mifflin Company, 1942.