Artikel Jurnal
Devita Risvanti, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2016
UI - Tesis Membership
Kerpen, Dave, author
McGraw-Hill, 2011
Buku Teks
Carlson, Richard, 1961-, author
Gramedia Pustaka Utama , 2003
Buku Teks
Barbira-Freedman, Francoise, author
Lorenz Books, an imprint of Anness Publishing, 2014
Buku Teks