Gibbons, T. M. (1973). Waves in nature. Heinemann Educational.
Chicago Style aipamenaGibbons, Trevor M. Waves in Nature. South Yarra, Vic.: Heinemann Educational, 1973.
MLA aipamenaGibbons, Trevor M. Waves in Nature. Heinemann Educational, 1973.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.