Untung Setiyo Purwanto, author
Gadjah Mada University Press, 1993
Buku Referensi
Untung Widodo, author
UGM , 1993
Buku Teks
KAT International Marketing Service, 1972
Buku Referensi
Fletcher, Richard B., author
Routledge, 2011
Buku Teks
Ehrenfeld, Michael, author
AO Foundation, 2012
Buku Teks