http://navercast.naver.com/contents.nhn?rid=77&contents_id=5210
이순신 (navercast)
http://terms.naver.com/entry.nhn?docId=1732768&cid=49358&categoryId=49358
명량해전 (naver 지식백과)
http://navercast.naver.com/contents.nhn?rid=107&contents_id=5236
거북선 (navercast)