edited by Roy O. Grepp
Schenkman Publishing Company, Inc., 1963
Buku Teks
Freedman, Ronald
Irvington, 1975
Buku Teks
McNicoll, Geoffrey
Gadjah Mada University Press, 1986
Buku Teks
Palmore, James A.
East West Center Press, 1987
Buku Teks
Pasaribu, William Aaron Marudut
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2024
UI - Skripsi Membership