Kotler, Philip, author
Prentice-Hall, 2003
Buku Teks
Kotler, Philip, author
Prentice-Hall, 1989
Buku Teks
Kotler, Philip, author
Pearson Education, 2006
Buku Teks
Brech, E.F.L., author
Longmans, Green & Co. , 1957
Buku Teks
Brech, E.F.L., author
Longman , 1970
Buku Teks