* "Why Go To The Arctic", January 1931, Popular Mechanics drawing of ill fated Andree balloon flight top page 26* "Ice Balloon: Doomed Arctic expedition to the North Pole", bbc.co.uk video== مراجع ==
*"Why Go To The Arctic", January 1931, Popular Mechanics drawing of ill fated Andree balloon flight top page 26*"Ice Balloon: Doomed Arctic expedition to the North Pole", bbc.co.uk video