Gaya APA

Johnson, D, W. (2009). Joining Together : Group theory and group skills: Seventh edition (10th Ed). New Jersey: Pearson education Inc..

Gaya MLA

Johnson, David, W. "Joining Together : Group theory and group skills: Seventh edition". 10th Ed New Jersey: Pearson education Inc., 2009. Hibah Buku Dra. Anita Lestari,.