Gaya APA
Arnold,Virginia A. (1991).
Observing .
New york:
Macmillan Publishing Company.
Gaya Chicago
Arnold,Virginia A.
Observing.
New york:
Macmillan Publishing Company,
1991.
Buku.
Gaya MLA
Arnold,Virginia A.
Observing.
New york:
Macmillan Publishing Company,
1991.
Buku.
Gaya Turabian
Arnold,Virginia A.
Observing.
New york:
Macmillan Publishing Company,
1991.
Buku.