Student's book 3A [Text] : Seoul National University / E. Choi J. Kim H. Kim Y. Chung ; [translator R. Carrubba] ; Seoul National University ; Language Education Institute... – Seoul : Twoponds Co, 2015. - 282 p., ill.;+ 1 electronic optical disc (CD-disk) . - Text in Korean and English . . – [n. c.] – ISBN 978-89-539-3908-0, ISBN 978-89-539-3432-0 : 60 tg.