第一级火箭回收

[1]	Grush L. SpaceX successfully lands its rocket on a floating drone ship for the first time [Internet]. New York: The Verge. 2016 Apr 8 [cited 2016 May 3]. Available from: http://www.theverge.com/2016/4/8/11392138/spacex-landing-success-falcon-9-rocket-barge-at-sea.
[2]	Malik T. The Falcon has landed! Epic views of SpaceX's amazing rocket landing [Internet]. New York: Space.com. 2015 Dec 22 [cited 2016 May 3]. Available from: http://www.space.com/31444-spacex-falcon-rocket-landing-epic-photos.html.
[3]	SpaceX.com [Internet]. Hawthorne: Space Exploration Technologies Corp.; c2016 [cited 2016 May 3]. Available from: http://www.spacex.com/.
[4]	Limer E. You can practically smell the rocket fuel in SpaceX's barge landing photos [Internet]. New York: Popular Mechanics. 2016 Apr 12 [cited 2016 May 3]. Available from: http://www.popularmechanics.com/space/rockets/advice/g2571/space-x-barge-landing-photos/.
[5]	Falcon 9 [Internet]. Hawthorne: Space Exploration Technologies Corp.; c2016 [cited 2016 May 3]. Available from: http://www.spacex.com/falcon9.
[6]	Rocket engine [Internet]. San Francisco: Wikimedia Foundation, Inc.; [cited 2016 May 3]. Available from: https://en.wikipedia.org/wiki/Rocket_engine.
[7]	About SpaceX [Internet]. Hawthorne: Space Exploration Technologies Corp.; c2016 [cited 2016 May 3]. Available from: http://www.spacex.com/about.
[8]	Falcon Heavy [Internet]. Hawthorne: Space Exploration Technologies Corp.; c2016 [cited 2016 May 3]. Available from: http://www.spacex.com/falcon-heavy.