Siagian, R. C., Arip Nurahman, Goldberd Harmuda Duva Sinaga, Reza Ariefka, and Pandu Pribadi. “Exploring Celestial Object Characteristics: An In-Depth Analysis of Quasars, Stars, and White Dwarfs Using the Sloan Digital Sky Survey (SDSS) Dataset”. TIME in Physics, vol. 2, no. 1, Mar. 2024, pp. 1-16, http://ejournal.universitasmandiri.ac.id/index.php/timeinphys/article/view/32.