Ardianto, Ricky, and Ribangun Bamban Jakaria. “American Productivity Center (APC) and Craig-Harris Productivity Model Method in Measuring the Productivity of Customs Companies: Metode American Productivity Center (APC) Dan Craig -Harris Productivity Model Dalam Mengukur Produktivitas Perusahaan Kepabeanan”. Procedia of Engineering and Life Science, vol. 1, no. 1, Feb. 2021, doi:10.21070/pels.v1i1.647.