Ballou, Ronald H.
Prentice-Hall, 1973
Buku Teks
Ballou, Ronald H.
Englewood Cliffs, Prentice-Hall
Buku Teks
Ballou, Ronald H., author
Prentice-Hall, 2004
Buku Teks
Ballou, Ronald H.
Prentice Hall International I, 1992
Buku Teks
Bowersox, Donald J., author
McGraw-Hill, 2010
Buku Teks