STEELE, H. (1998). GEOLOGY AND CHANGE. TIME LIFE PUBLICATIONS.
Chicago Style aipamenaSTEELE, HOPE. GEOLOGY AND CHANGE. ASIA: TIME LIFE PUBLICATIONS, 1998.
MLA aipamenaSTEELE, HOPE. GEOLOGY AND CHANGE. TIME LIFE PUBLICATIONS, 1998.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.