Gill, John
Paul Chapman Publishing, 1991
Buku Teks
Gill, John
Paul Chapman Publishing, Inc, 1991
Buku Teks
Retno Wulandari, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 1993
UI - Skripsi Membership
Zulfia Hanum Alfi Syahr, author
Research and Development Agency Ministry of Home Affairs, 2018
Artikel Jurnal
Costantino Thanos, Francesca Borri, Leonardo Candela, editor
Springer, 2007
Buku Teks