Christopher, E.P.
McGraw-Hill, 1958
Buku Teks
Cambridge University Press, 2014
Buku Teks
Hubbard, L. Ron, 1911-1986
Bridge Publications, Inc., 2012
Buku Referensi
Ken Suratiyah
Penebar Swadaya, 2006
Buku Teks
Janick, Jules
W.H. Freeman, 1972
Buku Teks