S. E. Wibowo, “Kesalahan Ejaan dan Ketidakbakuan Kata pada Karangan Mahasiswa Progdi PJKR UNSIKA: Spelling Errors and Inaccuracies in Word Usage in Essays by Physical Education Health Recreation Students at UNSIKA”, Jubasan, vol. 2, no. 1, pp. 20-28, Apr. 2018.