1. · (2003).. <>, 15(1), 171-179.
2. · (2016). . < >, 17(4), 188-198.
3. (2016.03.11).. https://scienceon.kisti.re.kr/commons/util/originalView.do?cn=TRKO201600000952&dbt=TRKO&rn=
4. (2018).7 3(2018). http://www.mohw.go.kr/react/al/sal0301vw.jsp?PAR_MENU_ID=04&MENU_ID=0403&CONT_SEQ=351319
5. · (2013).. < >, 123-123.