Mangan, James T., author
The secret of perfect living
Prentice-Hall, 1963
 Buku Teks
Cossman, Joe
Wujudkan impian anda: rahasia membangun kekayaan dari dua wiraswastawan sukses = Making it! Wealth-building secret from two great entrepreneurial minds / Joe Cossman, William A. Cohen ; Alihbahasa, Haris Munandar; Penyunting, Sigit Maryanto
Prenhallindo , 1997
 Buku Teks
Ray, James Arthur, author
Harmonic wealth: the secret of attracting the life you want = kekayaan harmonis rahasia menciptakan kehidupan yang anda inginkan
Gramedia Pustaka Utama, 2009
 Buku Teks
Roberts, Ken
A rich man's secret : an amazing formula for success /​ Ken Roberts.
Llewellyn Publications, 1995.
 Buku Teks
Bell, O.O.
Goaling up
Everest Publishing Company, 1977
 Buku Teks
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