Ikeda, Daisaku, 1928-
Life : an enigma, a precious jewel
Kodansha International, 1982
 Buku Teks SO
Dalziel, Allan J.
Evatt the Enigma
Lansdowne Press, 1967
 Buku Teks SO
Scott, Paul
The jewel in the crown / Paul Scott
Panther Books, 1983
 Buku Teks SO
Jones, Margaret
The confucius enigma / Margaret Jones
McGraw-Hill, 1979
 Koleksi Publik
Field, Andy P.
Discovering statistics : the reality enigma
SAGE Publications, 2016
 Buku Teks SO