Hongdiyanto, Charly, et al. “Optimalisasi Keuntungan UMKM Di Tulungagung Melalui Perhitungan Harga Pokok Produksi Yang Akurat ”. Jurnal Leverage, Engagement, Empowerment of Community (LeECOM), vol. 5, no. 2, Nov. 2023, pp. 73–80, doi:10.37715/leecom.v5i2.3690.