According to Mr. Wu Che-fu from the National Palace Museum, library chops are usually stamped in the blank space just below the title of the first chapter in ancient books.
據故宮博物院文獻處吳哲夫表示，一般藏書印的「規矩」，是鈐蓋在古籍卷一、第一行、大題下面的空白處，由最下面開始鈐蓋起。