Gaya APA
Drajad, W.
(2005).
Jendela cakrawala kewirausahaan
.
Bogor:
IPB Press.
Gaya MLA
Drajad, Widodo,Winarso.
"Jendela cakrawala kewirausahaan".
Bogor:
IPB Press,
2005.
Textbook.