by 최진(Jeen Choi)
Published in Korean Journal of child studies (1980)

by 천지혜, Cheon Ji Hye, 김현중, Kim Hyun Joong
Published in 기초조형학연구 (31.08.2019)

by 박순만(Park, Soon Marn), 최총명(Choi, Chong Myoung), 김진녀(Kim, Jin Nyo), 변상해(Byun, Sang Hae)
Published in 벤처창업연구 (2013)