Lewis, R. (1981). How to tutor in an open learning scheme: Self-study version (1. publ.). Council for Educational Technology.
Chicago-Zitierstil (17. Ausg.)Lewis, Roger. How to Tutor in an Open Learning Scheme: Self-study Version. 1. publ. London: Council for Educational Technology, 1981.
MLA-Zitierstil (9. Ausg.)Lewis, Roger. How to Tutor in an Open Learning Scheme: Self-study Version. 1. publ. Council for Educational Technology, 1981.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.