“Entertainment Cost Efficiency Analysis With Data Envelopment Analysis (Dea) And Fuzzy Logic (Flp & C-Iowa) Approach To Sales Level: Analisa Efisiensi Biaya Entertainment Dengan Pendekatan Data Envelopment Analysis (Dea) Dan Fuzzy Logic (Flp & C-Iowa) Terhadap Tingkat Penjualan” (2021) Procedia of Engineering and Life Science, 1(1). doi:10.21070/pels.v1i1.853.