Dian Hanif, Yudha Pradana, Sudarmiatin Sudarmiatin, and Ita Prihatining Wilujeng, “The Analysis of the Application of 7Ps in Improving the Lambau Semboro Jember Billiards Service Business”, HarmoniEconomics, vol. 2, no. 4, pp. 152–157, Nov. 2025.