Whittington, Ray, 1948-, author
Mc Graw-Hill, Irwin, 2000
Buku Teks
Gray, Iain, author
Cengage Learning, 2015
Buku Teks
Putri Prastica Yuliana Alamta, author
2018
UI - Tugas Akhir
Porter, Brenda, author
John Wiley & Sons, 2014
Buku Teks
Siti Hajar, author
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2008
UI - Skripsi (Open)