Cita APA (7th ed.)

Johnson, D. W., & Johnson, F. P. (1991). Joining together: Group theory and group skills (4th ed.). Prentice-Hall.

Cita Chicago (17th ed.)

Johnson, David W., i Frank P. Johnson. Joining Together: Group Theory and Group Skills. 4th ed. New Jersey: Prentice-Hall, 1991.

Cita MLA (9th ed.)

Johnson, David W., i Frank P. Johnson. Joining Together: Group Theory and Group Skills. 4th ed. Prentice-Hall, 1991.