Hippel, E. v. (1988). The sources of innovation. New York: Oxford University Press.
Trích dẫn kiểu ChicagoHippel, Eric von. The Sources of Innovation. New York: Oxford University Press, 1988.
MLA引文Hippel, Eric von. The Sources of Innovation. New York: Oxford University Press, 1988.
警告:這些引文格式不一定是100%准確.