Joining together

MLA

Johnson, David W., and Frank P Johnson. Joining Together : Group Theory and Group Skills. Twelfth edition. New York, NY: Pearson, 2017.

APA

Johnson, D. W., & Johnson, F. P. (2017). Joining together : group theory and group skills. Twelfth edition. New York, NY: Pearson.

Chicago

Johnson, David W., and Frank P Johnson. Joining Together: Group Theory and Group Skills. Twelfth edition. New York, NY: Pearson, 2017.