Adding photo citation

Author: mjenmana

_pages/about.md

@@ -11,7 +11,7 @@ social: false # includes social icons at the bottom of the page
 <div style="text-align: center;">
     <img src="/assets/img/thammasat.jpg" alt="Thammasat University, opened in 1934, is the first public university in Thailand." width="80%">
     <p style="font-size: 0.9em; color: #555; margin-top: 0.5em;">
-        Thammasat University, opened in 1934, was the first public university in Thailand. Photo: National Archives of Thailand.
+        Thammasat University, opened in 1934, was the first public university in Thailand. Photo: National Archives of Thailand. (1934).
     </p>
 </div>