APA ציטוט

Hippel, E. v. (1988). The sources of innovation. New York: Oxford University Press.

Trích dẫn kiểu Chicago

Hippel, Eric von. The Sources of Innovation. New York: Oxford University Press, 1988.

ציטוט MLA

Hippel, Eric von. The Sources of Innovation. New York: Oxford University Press, 1988.