Citazione APA

Johnson, D. W., & Johnson, F. P. (1982). Joining together: Group theory and group skills (Ed.2.).

Stile di citazione Chicago

Johnson, David W., e Frank P. Johnson. Joining Together: Group Theory and Group Skills. Ed.2. New Jersey, Prentice Hall Inc, 1982.

Citazione MLA

Johnson, David W., e Frank P. Johnson. Joining Together: Group Theory and Group Skills. Ed.2. 1982.