Newark, Quentin, author
RotoVision, 2002
Buku Teks SO
Eskilson, Stephen, author
Laurence King , 2012
Buku Teks SO
Stevenson, George A., author
McGraw-Hill, 1979
Buku Referensi
Daniels, Lawrence J., 1942- , author
[American Management Association;, ], 2013
eBooks
Bob Gordon, consultant editor; Maggie Gordon, consultant editor
Watson-Guptill Publications, 2002
Buku Teks SO