Della illustrazione delle lingue antiche e moderne e principalmente dell'italiana procurata nel secolo XVIII. dagli Italiani - Parte I

An essay on the origin of language, based on modern researches, and especially on the works of M. Renan

Della illustrazione delle lingue antiche e moderne e principalmente dell'italiana procurata nel secolo XVIII. dagli Italiani - Parte II

Duality of Voice

Introduction to the science of language, Volume 1 (of 2)

Introduction to the study of the history of language

Language: An Introduction to the Study of Speech

Language: Its Nature, Development and Origin

Lectures on the Science of Language

On the Evolution of Language First Annual Report of the Bureau of Ethnology to the Secretary of the Smithsonian Institution, 1879-80, Government Printing Office, Washington, 1881, pages 1-16

Opuscula: Essays chiefly Philological and Ethnographical