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Ubort Unorthodox Jukebox U-boatTài liệu tham khảo
WikiPedia: Ubort http://bse.sci-lib.com/article113406.html http://www.tabletmag.com/jewish-news-and-politics/... http://geonames.nga.mil/ggmagaz/detaillinksearch.a... http://geonames.nga.mil/ggmagaz/detaillinksearch.a... //tools.wmflabs.org/geohack/geohack.php?language=v... //tools.wmflabs.org/geohack/geohack.php?language=v... //tools.wmflabs.org/geohack/geohack.php?language=v... //tools.wmflabs.org/geohack/geohack.php?language=v... //www.worldcat.org/oclc/749097432 http://dir.icm.edu.pl/pl/Slownik_geograficzny/Tom_...