H. Susanto, Seanewati Oetama, Eko Cahyo Purnomo, Guruh Fajar Alamsyah, Bio Ertanto, and Rika Kristi, “The Influence of Need and Scarcity on the Decision to Purchase Gas LPG 3 Kg at Cv Berkat Keluarga”, IJSTM, vol. 7, no. 4, pp. 474–481, Jul. 2026.