Roberts, A. C., & Draper, E. M. (1927). The high school principal as administrator, supervisor, and director of extracurricular activities. D. C. Heath and Company.
Chicago-referens (17:e uppl.)Roberts, Alexander Crippen, och Edgar Marian Draper. The High School Principal as Administrator, Supervisor, and Director of Extracurricular Activities. Boston: D. C. Heath and Company, 1927.
MLA-referens (8:e uppl.)Roberts, Alexander Crippen, och Edgar Marian Draper. The High School Principal as Administrator, Supervisor, and Director of Extracurricular Activities. D. C. Heath and Company, 1927.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.