Jaspers, Karl,
Routledge and Kegan Paul, 1953
Buku Teks
Jaspers, Karl
London : Routledge & Kegan Paul Ltd., 1953.
Buku Teks
Budhy Kusworo
Universitas Indonesia, 1989
UI - Skripsi (Membership)
Mardety
Universitas Indonesia, 1988
UI - Skripsi (Membership)
Diamond, A. S. (Arthur Sigismund)
Methuen , 1959
Buku Teks