APA-viite (7. p.)

de Graaff, E., & Bouhuijs, P. A. (1993). Implementation of problem-based learning in higher education. Thesis Publishers.

Chicago-viite (17. p.)

de Graaff, Erik, ja Peter A. Bouhuijs. Implementation of Problem-based Learning in Higher Education. Amsterdam: Thesis Publishers, 1993.

MLA-viite (9. p.)

de Graaff, Erik, ja Peter A. Bouhuijs. Implementation of Problem-based Learning in Higher Education. Thesis Publishers, 1993.