Gaya APA
Arnold,Virginia A. (1989).
Frontiers .
New york:
Macmillan Publishing Company.
Gaya Chicago
Arnold,Virginia A.
Frontiers.
New york:
Macmillan Publishing Company,
1989.
Buku.
Gaya MLA
Arnold,Virginia A.
Frontiers.
New york:
Macmillan Publishing Company,
1989.
Buku.
Gaya Turabian
Arnold,Virginia A.
Frontiers.
New york:
Macmillan Publishing Company,
1989.
Buku.