Professor Park, Hae-ok's thesis titled 'Effects of EFL process drama on the development of English learner's 21st-century skills: based on the perspectives of English teachers' is published.

Park, H. O. (2022). Effects of EFL process drama on the development of English learner's 21st-century skills: based on the perspectives of English teachers. The Journal of Foreign Studies, 61, 72~104.