Ptolemy,  Pirckheimer, Willibald,  Regiomontanus, Joannes,  and Grüninger, Johann, d. 1532?.  "Tabula I Aphri."  Map.  1525.  Norman B. Leventhal Map & Education Center,  https://collections.leventhalmap.org/search/commonwealth:st74cz23q (accessed November 17, 2018).