Debenham, A. I. S. (1968). A training officer's guide to discussion leading. British Association for Commercial and Industrial Education.
Chicago-viite (17. p.)Debenham, A. I. S. A Training Officer's Guide to Discussion Leading. London [England]: British Association for Commercial and Industrial Education, 1968.
MLA-viite (8. p.)Debenham, A. I. S. A Training Officer's Guide to Discussion Leading. British Association for Commercial and Industrial Education, 1968.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.