Rien T. Segers, editor
Springer International Publishing, 2016
eBooks
Turner, Louis
Hamish Hamilton , 1970
Buku Teks
Ball, Donald A.
Irwin/McGraw-Hill, 2002
Multimedia
Michael R. Czinkota, Ronkainen Ilkka A., Michael H.Moffett, Eugene O. Moynihan, ... [et al.].
Harcourt College publishers, 2001
Buku Teks
Pettinger, Richard
Capstone Publishing, 2002
Buku Teks