Gaya APA
Training in inter personal skills. (2003).
New Jersey:
Prentice Hall.
Gaya Chicago
Training in inter personal skills.
3.
New Jersey:
Prentice Hall,
2003.
Buku.
Gaya MLA
Training in inter personal skills.
3.
New Jersey:
Prentice Hall,
2003.
Buku.
Gaya Turabian
Training in inter personal skills.
New Jersey:
Prentice Hall,
2003.
Buku.