Ruhnken, D., Epistola critica I. in Homeridarum hymnos et Hesiodum, ad virum clarissimum, Ludov. Casp. Valckenarium (Lugduni Batavorum, 1749). Google Books: 1
--- Epistola critica II. in Callimachum et Apollonium Rhodium, ad virum clarissimum, Joan. Augustum Ernesti (Lugduni Batavorum, 1751). Google Books: 1