Ch'oe, Hong-gyu 崔 洪奎 <br/><br/>
U Ha yông ûi sirhak sasang yôn'gu 禹 夏永 의 實學 思想 硏究   
Ch'oe, Hong-gyu 崔 洪奎 
 - Sôul  1995  一志社  1995 
 - 418 p. 
<br/><br/><label>ISBN: </label>8931204442 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Philosophy -- Various Schools -- Practical Learning -- U, Ha-yông