Dolman, Carol, author
Glorier International, 2001
Buku Referensi
Humphries, john, author
Glorier International, 1999
Buku Referensi
Humphries, john, author
Glorier International, 1999
Buku Referensi
Chalmers, James, author
Glorier International, 1999
Buku Referensi
Michael R. Czinkota, Ronkainen Ilkka A., Michael H.Moffett, Eugene O. Moynihan, ... [et al.].
Harcourt College publishers, 2001
Buku Teks