أول صاروخ يعملُ بالوقود السائل

1. Garner R. Dr. Robert H. Goddard, American Rocketry Pioneer [Internet]. NASA; 2022 [cited 2023 Jan 31]. Available from: هنا
2. Robert H. Goddard: American Rocket Pioneer [Internet]. Smithsonian Institution Archives. [cited 2023 Jan 31]. Available from: هنا
3. Robert Goddard: Class of 1908 and Father of Modern Rocketry [Internet] Worcester Polytechnic Institute. [cited 2023 Jan 31]. Available from: هنا