Hiroyuki KOGA. Trying KH Coder for Music Therapy Research. Japanese Journal of Music Therapy. 2022. 22. 1. 34-36
Hiroyuki Koga. A Study of Depressive Tendency and Image Association with Music Using Guided Imagery Music. JAPANESE JOURNAL OF MUSIC THERAPY. 2022. 21. 2. 129-143
Koga Hiroyuki. Examination of Skilled Instructors Perceptions of Dalcroze Eurhythmics. Eurhythmics Online Journal “Music and Movement”. 2021. 1. 1. 10-19
Koga Hiroyuki, Nagasu Masaaki. Activities of Children's Cafeterias and Food Banks. Graduate School of Humanities and Social Sciences. 2021. 36. 13-24