Cooper, Donald R., author
McGraw-Hill, 2014
Buku Teks
Cooper, Donald R., author
McGraw-Hill, 2006
Buku Teks
Ticehurst, George William, author
Longman, 2000
Buku Teks
Sekaran, Uma, author
John Wiley & Sons, 2016
Buku Teks
Sekaran, Uma, author
West Sussex : Wiley, 2013
Buku Teks