- http://book.naver.com/bookdb/book_detail.nhn?bid=8920762
- https://github.com/expert0226/oopinspring
2. 자바의 정석 기초편
- https://search.shopping.naver.com/book/catalog/32445669710?NaPm=ct%3Dlkbxp7eo%7Cci%3Dbecfbd3963973e6dbbdc6fb83db87eb42c734b65%7Ctr%3Dboksl1%7Csn%3D95694%7Chk%3D8d18a50987d5784ba78875012ef990635409e38a
- https://github.com/castello/javajungsuk_basic