Gaya APA
Collins, Gary. (1976).
How To Be A People Helper (Cet.1).
California:
Regal Books.
Gaya Chicago
Collins, Gary.
How To Be A People Helper.
Cet.1
California:
Regal Books,
1976.
Text.
Gaya MLA
Collins, Gary.
How To Be A People Helper.
Cet.1
California:
Regal Books,
1976.
Text.
Gaya Turabian
Collins, Gary.
How To Be A People Helper.
Cet.1
California:
Regal Books,
1976.
Print.