Schneider, Gerhard W.
Ronald , 1974
Buku Teks
editor, Gary Fromm
The Brookings Institution , 1971
Buku Referensi
Fayerweather, John
Prentice-Hall, 1965
Buku Teks
Maurer, Herrymon
Macmillan, 1956
Buku Teks
Siregar, Rotua Andriyati
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2020
UI - Tesis Membership