Gaya APA

Johnson, F, P., Johnson, D, W. (1982). Joining together : group theory and group skills (2nd.ed.). New Jersey: Prentice-Hall.

Gaya MLA

Johnson, Frank, P.., Johnson, David, W. "Joining together : group theory and group skills". 2nd.ed. New Jersey: Prentice-Hall, 1982. Text.