Não informado. (1963). Training directors journal. American Society of Training Directors.
Chicago-viite (17. p.)Não informado. Training Directors Journal. Alexandria, Va: American Society of Training Directors, 1963.
MLA-viite (8. p.)Não informado. Training Directors Journal. American Society of Training Directors, 1963.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.