Graves, John Thomas (J.T.G.).«Hyginus, gromaticus». A:William Smith. Dictionary of Greek and Roman Biography and Mythology(en anglès). vol. vol.1. Boston:Walton and Maberly,1848 (1873)[Consulta: 12d'agostde2015(2015-08-12)].«The Gromatici derived their name from the groma or gnomon [...].»