Matz, Adolph, author
Ohio South-Western Publishing , 1967/1991
Buku Teks
Eilon, Samuel, author
Macmillan, 1962
Buku Teks
Jonsson, Patrik, author
McGraw-Hill, 2009
Buku Teks
Kotler, Philip, author
Prentice Hall International, 1980
Buku Teks
Kotler, Philip, author
Prentice-Hall, 1967
Buku Teks