Mill, John Stuart
Yayasan Obor Indonesia, 1996
Buku Teks
Aulia Rachmah Putri
2015
UI - Skripsi (Membership)
Charles W. Eliot, edited
P. F. Collier & Son Corporation, 1959
Buku Referensi
Mill, John Stuart
Connecticut Greenwood Press , 1969
Buku Teks
Hutabarat, Nadia Carolina
Universitas Indonesia, 2015
UI - Skripsi (Membership)