Zia Thahira, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2022
UI - Tesis (Membership)
DeFrancisco, Victoria Pruin, author
Sage, 2007
Buku Teks
British Council, 1996
Buku Teks
Christina Natalia, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2013
UI - Tesis (Membership)
Dana Carera, author
2016
UI - Skripsi (Membership)