Thực đơn
Dù_nhảyThực đơn
Dù_nhảyLiên quan
Dù nhảyTài liệu tham khảo
WikiPedia: Dù_nhảy http://www.cspa.ca http://www.airspacemag.com/flight-today/How-Things... http://books.google.com/books?id=xiADAAAAMBAJ&pg=P... http://www.google.com/patents?vid=4607814 http://www.ParachuteHistory.com http://www.scientificamericanpast.com/Scientific%2... http://www.skydivesf.com/skydiving/skydiving%20ins... http://contentdm.lindahall.org/cdm4/browse.php?CIS... http://www.uspa.org http://www.canopypiloting.co.za/