Zufelt, Jack M
The DNA of success
Interaksara, 2004
 Buku Teks SO
Hill, Napoleon
The law of success
Jeremy P. Tarcher/​Penguin, 2008
 Buku Teks
Success with language
New York : Routledge , 2005
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Bruner, Jerome Seymour
Acts of meaning
Harvard University Press, 1990
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Jackson, Howard, 1945-
Words and their meaning
Longman, 1996
 Buku Teks SO