Cita APA (7th ed.)

Johnson, D. W., & Johnson, F. P. (2006). Joining together: Group theory and group skills (9th ed.). Pearson Education.

Cita Chicago (17th ed.)

Johnson, David W., i Frank P. Johnson. Joining Together: Group Theory and Group Skills. 9th ed. Upper Saddle River, N.J: Pearson Education, 2006.

Cita MLA (9th ed.)

Johnson, David W., i Frank P. Johnson. Joining Together: Group Theory and Group Skills. 9th ed. Pearson Education, 2006.