Argenti, John, author
Wiley , 1974
Buku Teks
Walker, Gordon, author
McGraw-Hill-Irwin, 2004
Buku Teks
Aaker, Davis A.
John Wiley , 1984
Buku Teks
Le Breton, Preston P.
Prentice-Hall, 1961
Buku Teks
Jones, Harry, 1911-, author
Gower Press , 1974
Buku Teks