Hill, Napoleon
The law of success
Jeremy P. Tarcher/​Penguin, 2008
 Buku Teks
Success with language
New York : Routledge , 2005
 Buku Teks
Zufelt, Jack M
The DNA of success
Interaksara, 2004
 Buku Teks SO
Cole, George Douglas Howard, 1889-1959
The Meaning of marxism
Victor Gollancz, 1950
 Buku Teks
Padover, Saul K. (Saul Kussiel)
The meaning of democracy
Praeger, 1967
 Buku Teks