Sutton, Garrett, author
Gramedia Pustaka Utama, 2005
Buku Teks
Consumers' Association and Hodder and Stoughton , 1988
Buku Teks
Mohammad Farrell Bossman, author
Fakultas Ilmu Pengetahuan Budaya Universitas Indonesia, 2023
UI - Makalah dan Kertas Kerja
Heath, Joseph, author
Capstone, 2005
Buku Teks
Kotter, John P., 1947-, author
Prenhallindo, 1997
Buku Teks