Developed a vocabulary book for elementary school student and for junior prep. 

Developed student book, storybook, and workbook for alphabet learning

Developed student book, storybook, and workbook for alphabet learning

Developed two phonics student books and two workbooks

Developed six storybooks and six workbooks for young learners

Developed four English conversation series books

Developed two TOEIC prep books and two actual test books.

Developed 256 chomokdal storybooks and 72 workbooks