Ladd, Ned, Katharyn Nottis, and Patricia Udomprasert. “A Hybrid Hands-On And Computer Simulation Laboratory Activity For The Teaching Of Astronomical Parallax”. Journal of Astronomy & Earth Sciences Education (JAESE) 6, no. 2 (December 1, 2019): 31-44. Accessed July 6, 2020. https://clutejournals.com/index.php/JAESE/article/view/10338.