Brady, James E., author
[publisher not identified], [date of publication not identified]
Buku Teks
Malone, Leo J., author
John Wiley & Sons, 1981
Buku Teks
Artikel Jurnal
Erika Mustika Nugroho, Author
Universitas Indonesia, 2014
UI - Skripsi (Membership)
Prastika Krisma Jiwanti, author
Universitas Indonesia, 2014
UI - Skripsi (Membership)