Jaspers, Karl
Routledge & Kegan Paul LTD., 1949
Buku Teks
Jaspers, Karl,
Routledge and Kegan Paul, 1953
Buku Teks
Nakamura, Hajime, author
Kodansha, 1975
Buku Teks
Darcy, Martin Cyril
Faber and Faber , 1959
Buku Teks
Hook, Sidney, author
Beacon Press, 1943
Buku Teks