Pratiwi, K.D. and Djuminah 2025. Covid-19 dan Efisiensi Biaya Operasional terhadap Pendapatan Operasional (BOPO). Jurnal Manajemen Dayasaing. 27, 2 (Dec. 2025), 64–72. DOI:https://doi.org/10.23917/dayasaing.v27i2.12039.