(2013). 'When a great tree falls...'. U.P. News.
Chicago Style aipamena"'When a Great Tree Falls...'." U.P. News 2013.
MLA aipamena"'When a Great Tree Falls...'." U.P. News, 2013.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.
APA aipamena