Dyfyniad APA
Helfman, G. S., & Collette, B. B. (2011). Fishes: The animal answer guide. Johns Hopkins University Press.
Dyfyniad Arddull Chicago
Helfman, Gene S., and Bruce B. Collette. Fishes: The Animal Answer Guide. Baltimore: Johns Hopkins University Press, 2011.
Dyfyniad MLA
Helfman, Gene S., and Bruce B. Collette. Fishes: The Animal Answer Guide. Johns Hopkins University Press, 2011.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.