Dai Buell, Boston, pianist, from a 1920 publication.
No photographer credited.
<cite class="book" style="font-style:normal">Musical Courier Co. (January 1, 1920)      <i> <a rel="nofollow" class="external text" href="https://books.google.com/books?id=y-w6AQAAMAAJ&amp;pg=RA1">The Music Magazine-Musical Courier</a></i>, LXXX (Public domain ed.), <a href="https://en.wikipedia.org/wiki/en:Category:New_York" class="extiw" title="w:en:Category:New York"><span title="Wikimedia category">Category:New York</span></a>:  Musical Courier Co., pp. 1–  <small></small></cite>