Johnson, G. B. (2006). The living world. Boston, MA: McGraw-Hill.
Chicago Style aipamenaJohnson, George Brooks. The Living World. Boston, MA: McGraw-Hill, 2006.
MLA aipamenaJohnson, George Brooks. The Living World. Boston, MA: McGraw-Hill, 2006.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.