알라딘 검색이 응답하지 않아, 서재와 국립중앙도서관에서만 찾았어요.
[contributors: Eunyoung Choi, Giseong Kim, Jae Ik Kim, Jinyoo Kim, Euncheol Park, Inshik Pong, Jeonghoon Hong, Mina Kang, Eunhee Choi, Miseon Park, Wonseok Nam, Kyung-hwan Kim]
Statistics Korea