Yasmina Zubaedah, author
Universitas Indonesia, 2013
Artikel Jurnal
Adhikara Joshua Sutisna, author
2019
UI - Tesis (Membership)
Upshur, Carole C., author
Prentice-Hall, 1982
Buku Teks
Weaver, Charles N.
Syarikat First Agency, 1995
Buku Teks
Addison-Wesley Publishing Company, Inc., 1991
Buku Teks