- twitter.com natlaero?lang=ruDedicated to the advancement of the art, sport, and science of aviation in the U.S. @PulitzerAirRace...
- vk.com wall-98632269_2302Саня, пожалуйста. http://www.nationalaviation.org/images/nominees/2016/.. https://www.youtube.com/watch?v=twvpxNU0rBM Со страницы 109.
- ok.ru video/285427828216Igor Sikorsky profile on the website of The National Aviation Hall of Fame: http://www.nationalaviation.org/our-enshrinees/sikorsky-igor-ivanovich/ 16.