Haas, Robert W
Kent, 1982
Buku Teks
Gronroos, Cristian
Lexington Book6c1990, 0
Buku Teks
Buskirk, Richard Hobart, 1927-, author
Holt Rinehart, 1961
Buku Teks
Buskirk, Richard Hobart, 1927-, author
Holt Rinehart, 1970
Buku Teks
Keegan, Warren J., author
Prentice-Hall, 1980
Buku Teks