@book{KOSIS2023,
author = {KOSIS},
title= {Average birth age of mothers by province/city/birth rank 1993–2022},
year = {2023},
URL = {https://kosis.kr/statHtml/statHtml.do?orgId=101&tblId=DT_1B81A20&conn_path=I2},
address = {Daejeon},
publisher = {Statistics Korea},
}