Textbook and workbook for registered sales representatives by the strongest YouTuber instructor. - Title: Tatsuya Ishikawa's Registered Sales Representative Textbook & Workbook - Revised Edition: 3rd Revised Edition - Author: Tatsuya Ishikawa - Features: Popular lectures by the strongest YouTuber instructor - Contents: Set of textbook and workbook - Size: Approximately 2cm thick - Publisher: KADOKAWA Purchase price: 2,640 yen I read it once after purchasing it new. There are no noticeable stains, and it's like new.