http://en.wikipedia.org/wiki/Quadcopter

http://www.flyingcameras.ca/blog/the-rapid-rise-of-the-multicopter-and-the-dji-phantom/

http://www.clickeric.com/2012/01/12/i-need-this-parrot-ar-drone/

http://store.scoutuav.com/product/frames/scout-3-rtf/

http://design-engine.com/parrot-ar-drone-2-0-quadricopter/

http://www.aviastar.org/helicopters_eng/convertawings.php

http://en.wikipedia.org/wiki/File:Oemichen2.jpg

http://www.faa.gov/

http://www.faa.gov/about/initiatives/uas/

http://www.faa.gov/about/initiatives/uas/uas_faq/#Qn7

http://www.faa.gov/news/fact_sheets/news_story.cfm?newsId=14153

http://copter.ardupilot.com/wiki/initial-setup/assembly-instructions/

http://blog.tkjelectronics.dk/2012/03/quadcopters-how-to-get-started/

Mendes, J., & Ventura, R. (2013). ASSISTED TELEOPERATION OF QUADCOPTERS USING OBSTACLE AVOIDANCE. Journal Of Automation, Mobile Robotics & Intelligent Systems, 7(1), 54-58.