O'BRIEN, T. FUN FACTS SCIENCE. RUPA BOOKS.
Chicago Style aipamenaO'BRIEN, TERRY. FUN FACTS SCIENCE. FACTS; SCIENCE; INFORMATION: RUPA BOOKS.
MLA aipamenaO'BRIEN, TERRY. FUN FACTS SCIENCE. RUPA BOOKS.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.