APA-Zitierstil (7. Ausg.)

Willis, B. (1993). Distance education: A practical guide (1. printing.). Educational Technology Publ.

Chicago-Zitierstil (17. Ausg.)

Willis, Barry. Distance Education: A Practical Guide. 1. printing. Englewood Cliffs, N.J: Educational Technology Publ, 1993.

MLA-Zitierstil (9. Ausg.)

Willis, Barry. Distance Education: A Practical Guide. 1. printing. Educational Technology Publ, 1993.