Hardman, Martha J. 1985. Aymara and Quechua: Languages in Contact. In Klein, Harriet E. Manelis and Stark, Louisa R. (eds.), South American Indian Languages: Retrospect and Prospect, 616–643. Austin: University of Texas Press.
@incollection{nicholsdiversity-Hardman1985, address = {Austin}, author = {Hardman, Martha J.}, booktitle = {South American Indian Languages: Retrospect and Prospect}, editor = {Klein, Harriet E. Manelis and Stark, Louisa R.}, pages = {616–643}, publisher = {University of Texas Press}, title = {Aymara and Quechua: Languages in Contact}, year = {1985} }