Saputra, Johan. “Analisa Kepuasan Pelanggan Original Equipment Manufacturing Ban Motor Dengan Metode IPA-QFD: Studi Kasus Di PT. GTB”. Operations Excellence: Journal of Applied Industrial Engineering, vol. 12, no. 1, Mar. 2020, pp. 40-54, doi:10.22441/oe.2020.v12.i1.004.