Hester, J. (2007). 21st Century Astronomy Stars and Galaxies. McGraw Hill Companies Inc.
استشهاد بنمط شيكاغوHester, Jeff. 21st Century Astronomy Stars and Galaxies. McGraw Hill Companies Inc, 2007.
MLA استشهادHester, Jeff. 21st Century Astronomy Stars and Galaxies. McGraw Hill Companies Inc, 2007.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.