Elbeik, S. (1998). Project skills. Oxford: Butterworth-Heinemann.
Chicago Style aipamenaElbeik, Sam. Project Skills. Oxford: Butterworth-Heinemann, 1998.
MLA aipamenaElbeik, Sam. Project Skills. Oxford: Butterworth-Heinemann, 1998.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.