Hejhal, D. A. (1999). et al.
Chicago Style aipamenaHejhal, Dennis A. Et Al. Springer-Verlag, New York, 1999.
MLA aipamenaHejhal, Dennis A. Et Al. 1999.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.
APA aipamena
Hejhal, D. A. (1999). et al.
Chicago Style aipamenaHejhal, Dennis A. Et Al. Springer-Verlag, New York, 1999.
MLA aipamenaHejhal, Dennis A. Et Al. 1999.