Artikel Jurnal
Keller, Paul, author
McGraw-Hill, 2011
Buku Teks
edited by J. Bert Keats, Douglas C. Montgomery
Marcel Dekker, 1991
Buku Teks
Badavas, Paul C., author
Prentice-Hall, [Date of publication not identified]
Buku Teks
Melly Ujung, author
2001
UI - Tesis (Membership)