Prasetya Hari Ariadi, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2017
UI - Skripsi (Membership)
Jenny, Urs
Friedrich, 1967
Buku Teks
Jenny, Susan
Hoong Fatt Press, 1972
Buku Teks
Fitzgerald, Ross
University of Queensland Press, 1989
Buku Teks
E.E. Schaefer
State Public Relations Bureau, 1976
Buku Referensi