Krisnanto, Yustinus Albertus (2019) DEVELOPING S.M.I.L.E (SMART MOBILE INDEPENDENT LEARNING OF ENGLISH) AS ENGLISH LEARNING MEDIA BY IMPLEMENTING EPIGNOSIS LLC’S PRINCIPLES FOR VOCATIONAL HIGH SCHOOL. Skripsi thesis, Universitas Mercu Buana Yogyakarta.

Krisnanto, Yustinus Albertus (2019) DEVELOPING S.M.I.L.E (SMART MOBILE INDEPENDENT LEARNING OF ENGLISH) AS ENGLISH LEARNING MEDIA BY IMPLEMENTING EPIGNOSIS LLC’S PRINCIPLES FOR VOCATIONAL HIGH SCHOOL. Skripsi thesis, Universitas Mercu Buana Yogyakarta.

Krisnanto, Yustinus Albertus (2019) Developing S.M.I.L.E (Smart Mobile Independent Learning Of English) As English Learning Media By Implementing Epignosis Llc’s Principlesfor Vocational High School. Naskah Publikasi Program Studi Pendidikan Bahasa Inggris.