Leonhardt, Mary
Grasindo, 1995
Buku Teks
Allyn and Bacon, 1992
Buku Teks
Dhifani Lutya Azzahra
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2020
UI - Skripsi Membership
Institute for Contemporary studies, 1979
Buku Teks
Andie Sadhuputri
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2017
UI - Tesis Membership