APA (7th ed.) Zitazioa
Helmberg, G. (2007). Getting acquainted with fractals. Walter de Gruyter.
Chicago Style (17th ed.) Zitazioa
Helmberg, Gilbert. Getting Acquainted with Fractals. Berlin ; New York: Walter de Gruyter, 2007.
MLA (9th ed.) Zitazioa
Helmberg, Gilbert. Getting Acquainted with Fractals. Walter de Gruyter, 2007.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.