A rubbing of a Chinese cash coin from the book "Chinese Coins: Money in History and Society" authored by Liuliang Yu and Hong Yu.
Liuliang Yu and Hong Yu.
<ul><li><a rel="nofollow" class="external text" href="https://books.google.nl/books?id=QfWQB0peEWYC&amp;pg=PA20&amp;lpg=PA20&amp;dq=%22zhao+na+xin+bao%22&amp;source=bl&amp;ots=X9uIJJ6g0e&amp;sig=xvN7obOs3enQS1DmD_jE5ke2B1c&amp;hl=en&amp;sa=X&amp;redir_esc=y#v=onepage&amp;q=%22zhao%20na%20xin%20bao%22&amp;f=false">"Chinese Coins: Money in History and Society" By Liuliang Yu, Hong Yu</a>, <a rel="nofollow" class="external text" href="http://www.chinabooks.com/cart/home.php?cat=56">Long River Press</a> (<a rel="nofollow" class="external text" href="https://books.google.nl/">Google Books</a>).</li></ul>