Porterfield, J. (2018). The benefits of spaceflight and space exploration (First edition.). Britannica Educational Publishing in association with Rosen Educational Services.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Porterfield, Jason. The Benefits of Spaceflight and Space Exploration. First edition. New York, NY: Britannica Educational Publishing in association with Rosen Educational Services, 2018.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Porterfield, Jason. The Benefits of Spaceflight and Space Exploration. First edition. Britannica Educational Publishing in association with Rosen Educational Services, 2018.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.