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Pakpahan, Andrew Fernando and Prasetio, Adhi and Negara, Edi Surya and Gurning, Kasta and Situmorang, Risanti Febrine Ropita and Tasnim, Tasnim and Sipayung, Parlin Dony and Sesilia, Ayudia Popy and Rahayu, Puspita Puji and Purba, Bonaraja and Chaerul, Muhammad and Yuniwati, Ika and Siagian, Valentine and Rantung, Gilny Aileen Joan (2021) Metodologi Penelitian Ilmiah. Yayasan Kita Menulis.