Vogel, D., & Ledanff, G. (1978). The professional teacher preparation program of the college of education of the University of Houston: A case study. Institut fur Didaktik der Mathematik der Universitat Bielefeld.
Chicago-referens (17:e uppl.)Vogel, Dankwart, och G. Ledanff. The Professional Teacher Preparation Program of the College of Education of the University of Houston: A Case Study. Bielefeld, Germany: Institut fur Didaktik der Mathematik der Universitat Bielefeld, 1978.
MLA-referens (8:e uppl.)Vogel, Dankwart, och G. Ledanff. The Professional Teacher Preparation Program of the College of Education of the University of Houston: A Case Study. Institut fur Didaktik der Mathematik der Universitat Bielefeld, 1978.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.