Bell, O.O.
Goaling up
Everest Publishing Company, 1977
 Buku Teks
Linder, Jane C., author
Spiral up: and other management secrets behind wildly successful initiatives
American Management Association, 2008
 eBooks
Barker, Eric, author
Mendaki tangga yang salah: sebagian besar hal yang anda ketahui tentang kesuksesan adalah salah besar = Barking up the wrong tree: the surprising science behind why everything you know about success is (mostly) wrong
Gramedia Pustaka Utama, 2019
 Buku Teks
Mangan, James T., author
The secret of perfect living
Prentice-Hall, 1963
 Buku Teks
Herry Tjahjono
The Xo way: 3 giants & liliputs: jalan emas menuju kesejahteraan & kemakmuran hidup / Herry Tjahjono;
Gramedia, 2007
 Buku Teks
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