Fathimahhayati, L.D. et al. 2020. Analisis ergonomi pada perkuliahan daring menggunakan smartphone selama masa pandemi covid-19: studi kasus mahasiswa Prodi Teknik Industri Universitas Mulawarman. Operations Excellence: Journal of Applied Industrial Engineering. 12, 3 (Nov. 2020), 308–317. DOI:https://doi.org/10.22441/oe.2020.v12.i3.004.