Buskirk, Richard Hobart, 1927-, author
Holt Rinehart, 1961
Buku Teks
Buskirk, Richard Hobart, 1927-, author
Holt Rinehart, 1970
Buku Teks
Lovelock, Christopher H., author
Pearson Education international, 2002
Buku Teks
Enis, Ben M., author
Goodyear, 1974
Buku Teks
Kotler, Philip, author
Prentice-Hall, 1996
Buku Teks