APA aipamena

 Tollner, E. W. (2002).  Natural resources engineering.  Iowa State University Press.

Chicago Style aipamena

 Tollner, Ernest W.  Natural Resources Engineering.  Iowa State University Press, 2002.

MLA aipamena

 Tollner, Ernest W.  Natural Resources Engineering.  Iowa State University Press, 2002.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.