Schweitzer, Albert
New American Library, 1960
Buku Teks
Singer, Kurt D.
Wilco Publishing House, 2014
Buku Teks
Payne, Robert
Thomas Nelson & Sons, 1957
Buku Teks
Gollomb, Joseph
The Vanguard Press, 1949
Buku Teks
Gulden, Pieter Hendrik van der
Van Gorcum, 1943
Buku Teks