Churchill, Gilbert A.
Thomson, 2005
Buku Teks
Cooper, Donald R.
McGraw-Hill/Irwin, 2006
Buku Teks
by David A. Aaker ... [and others]
John Wiley & Sons, 2013
Buku Teks
Crisp, Richard D.
McGraw-Hill, 1957
Buku Teks
Aaker, David A.
John Wiley & Sons, 2000
Buku Teks