Alfi Yusrina Ramadhani, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2013
UI - Skripsi (Membership)
Garte, Seymour, author
American Management Association, 2008
eBooks
Kemp, David D., author
Routledge , 2004
Buku Teks
Mannion, A. M.
Longman Scientific & Technical, 1991
Buku Teks
Erika Cudworth, Stephen Hobden and Emilian Kavalski, editors
Routledge, Taylor & Francis Group, 2018
Buku Teks