“科技新时代”月刊中的周厚坤与他发明的中文打字机
Popular Science Monthly
<p><cite class="book" style="font-style:normal">Mullaney, Thomas S. (2017)      <i> The Chinese Typewriter: A History</i>, p. 146  <small><a href="https://en.wikipedia.org/wiki/International_Standard_Book_Number" class="extiw" title="en:International Standard Book Number">ISBN</a>:  <a href="//commons.wikimedia.org/wiki/Special:BookSources/9780262036368" title="Special:BookSources/9780262036368">9780262036368</a>. </small></cite> (Old version)
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It Take Four Thousand Characters to Typewriter in Chinese, Popular Science Monthly Volume 90 (p. 599) No. 4 (<a rel="nofollow" class="external free" href="https://archive.org/details/popularsciencemo90newyuoft/page/598/mode/2up">https://archive.org/details/popularsciencemo90newyuoft/page/598/mode/2up</a>)