“lingula”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
“lingula”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
lingula in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
lingula in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.
“lingula”, in Harry Thurston Peck, editor (1898), Harper's Dictionary of Classical Antiquities, New York: Harper & Brothers