Belch, George E., author
McGraw-Hill, [date of publication not identified]
Buku Referensi
Abdul Aziz, author
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2015
UI - Tesis (Membership)
Blythe, Jim, author
Prentice-Hall, 2000
Buku Teks
Eagle, Lynne, author
Taylor & Francis Group, 2015
Buku Teks
Egan, John, 1952-, author
Sage Publications, 2015
Buku Teks