Andreas Syngros (1823-1899). Athens, Photographic Archive of the Centre for Neohellenic Research-National Hellenic Research Foundation. Dertilis, G., To Zitima ton Trapezon (1871-73): Oikonomiki kai politiki diamachi stin Ellada tou 19ou ai., National Bank Cultural Foundation, Athens 1980, fig. 1. © Centre for Neohellenic Research-National Hellenic Reasearch Foundation, Athens.