Powell, J. W., Griffin, S., & Smithsonian Institution. Bureau of Ethnology. (1880). Introduction to the study of Indian languages: With words, phrases and sentences to be collected (Second edition, with charts.). Government Printing Office.

Powell, John Wesley, et al. Introduction to the Study of Indian Languages: With Words, Phrases and Sentences to Be Collected. Second edition, with charts. Government Printing Office, 1880.