Mochammad Singgih and Joko Priyono 2022. Analisis Pengembangan Strategi Pemasaran Koperasi Karyawan (KopKar) Untag Surabaya . Journal of Research and Technology. 8, 1 (Aug. 2022), 15–28. DOI:https://doi.org/10.55732/jrt.v8i1.628.