Kevin Valentino, author
2016
UI - Skripsi (Membership)
Lenin, Vladimir I., author
Foreign Languages Publishing House, 1954
Buku Teks
edited by Saxe Commins and Robert N. Linscott
Modern Pocket Library, 1947
Buku Teks
Buber, Martin
Beacon Press, 1955
Buku Teks
Yayasan Bina Ketenagakerjaan Indonesia, 2001
Buku Referensi