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O.k. (phim) O.K. John O.K. Corral O.F.Khamaria OK Computer Ōke no Monshō O.O Okazaki Shinji Oklahoma OkinawaTài liệu tham khảo
WikiPedia: O.k._(phim) http://www.berlinale.de/en/archiv/jahresarchive/19... http://www.german-films.de/en/germanfilmsquaterly/... https://www.dw.com/en/berlinale-looks-back-on-60-y... https://filmsbytheyear.com/o-k-1970/ https://books.google.com/books?id=6bmrDwAAQBAJ&q=o... https://www.nytimes.com/1970/07/04/archives/war-fi... https://stephenfollows.com/berlin-film-festival/ https://www.berlinale.de/en/press/press-releases/d... https://www.webcitation.org/5geL5kHyh?url=http://w...