생각,책

http://book.naver.com/bookdb/book_detail.nhn?bid=6606566

http://book.naver.com/bookdb/book_detail.nhn?bid=6454529

http://book.naver.com/bookdb/book_detail.nhn?bid=6735580

[http://www.aladin.co.kr/shop/wproduct.aspx?ISBN=8959244821]

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