Photograph of <a href="https://en.wikipedia.org/wiki/Alfred_Russel_Wallace" class="extiw" title="w:Alfred Russel Wallace">Alfred Russel Wallace</a>, taken in Singapore, 1862.
Unknown author<span style="display: none;">Unknown author</span>
1862
<cite class="book" style="font-style:normal" id="Reference-Marchant-1916">Marchant, James (1916)      <i> <a rel="nofollow" class="external text" href="http://www.gutenberg.org/files/15997/15997-h/15997-h.htm">Alfred Russel Wallace — Letters and Reminiscences</a></i>, Vol. 1, London, New York, Toronto and Melbourne:  Cassell and Company, pp. Plate between p. 36–37 Retrieved on 16 October 2005. <small></small></cite>