A. Saifullah, “Gugus Kendali Mutu: Suatu Upaya Meningkatkan Kualitas Output STAIN Jember: Quality Control Circle: An Effort to Improve the Output Quality of the State Islamic College (STAIN) Jember”, FN, vol. 3, no. 1, pp. 83–92, Mar. 2004, doi: 10.35719/fenomena.v3i1.347.