by 김정원(Jung Won Kim), 이정아(Jung A Lee)
Published in Korean Journal of child studies (01.08.2010)

by 강윤주, 김종희외2명
Published in Han'guk Yŏk Hakhoe chi (01.12.1996)

by 황해수(Hae Soo Hwang), 손원경(Won Kyoung Son)
Published in Korean Journal of child studies (2009)

by 김정원, 이정아, Kim, Jung-Won, Lee, Jung-A
Published in Korean Journal of child studies (2010)