Ptolemy,  and Hol, Lienhart.  "Duodecima et Ultima Asie tabula continet Taprobana insulam cum certeris insulis adiacentibus."  Map.  1482.  Norman B. Leventhal Map & Education Center,  https://collections.leventhalmap.org/search/commonwealth:7h14b131v (accessed October 30, 2020).