Rotch, William, author
Prentice-Hall, c1995
Buku Teks
Hackney, John W., author
John Wiley & Sons, 1965
Buku Teks
Kharbanda, O.P., author
Hampshire Gower Technical Press, 1980
Buku Teks
Anklesaria, Jimmy, author
American Management Association, 2008
eBooks
Birn, Serge A., author
McGraw-Hill, 1961
Buku Teks