Paglin, Morton, author
Hoover Institution Press, 1980
Buku Teks
Harrington, Michael
Penguin Books, 1981
Buku Teks
Lubis, Mhd. Idris Evrisal, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2021
UI - Tesis Membership
Popper, Karl R., author
Routledge, 1961
Buku Teks
Hollingworth, Peter, author
Nelson, 1983
Buku Teks