Gaya APA
Group Processes. (1989).
London:
Sage Publication.
Gaya Chicago
Group Processes.
Kedua.
London:
Sage Publication,
1989.
.
Gaya MLA
Group Processes.
Kedua.
London:
Sage Publication,
1989.
.
Gaya Turabian
Group Processes.
London:
Sage Publication,
1989.
.