Endangered Languages Catalogue Project. Compiled by research teams at University of Hawai'i Mānoa and Institute for Language Information and Technology (LINGUIST List) at Eastern Michigan University . (2012) ·

Language endangerment in South America: The clock is ticking ( pp. 167-234 ) . Crevels, Mily (2012) · In The Indigenous Languages of South America: A Comprehensive Guide edited by Lyle Campbell and Veronica Grondona · Mouton de Gruyter

South America ( pp. 103-196 ) . Mily Crevels (2007) · In Atlas of the World's Endangered Languages edited by C. Moseley · London & New York: Routledge

Nivaclé Grammar . Lyle Campbell, Luís Díaz, and Fernando Ángel (2020) · University of Utah Press

The World Atlas of Language Structures . (2005) · edited by Bernard Comrie and David Gil and Martin Haspelmath and Matthew S. Dryer · Oxford University Press

Who speaks what to whom?: Multilingualism and language choice in Misión La Paz – a unique case ( pp. 1-30 ) . Lyle Campbell and Verónica Grondona (2010) · Language in Society. 39

Vocabulario de la lengua Churupí ( pp. 73-97 ) . Max Schmidt (1940) · Revista de la Sociedad Científica del Paraguay. V

Manual de la lengua Nivaclé . Seelwische, José (1986) ·

La Lhasinônash napi Nivacle: Gramática Nivacle . José Seelwische (1975) · Asunción: "El Gráfico" S.~R.~L.

Chulupí: Esbozo gramatical analt́ico . B. Susnik (1968) · Asunción

Fonologia de la lengua axluxlaj . Stell, N. N. (1972) · Cuadernos de Linguistica Indigena · Vol. 8 · Centro de Estudios Linguisticos, University of Buenos Aires

Internal reconstruction in Chulupí (Nivaclé) ( pp. 1-29 ) . Lyle Campbell and Verónica Grondona (2007) · Diachronica. 24 (1) ·

The Linguistic Position of the Ashlushlay Indians ( pp. 86-91 ) . J. Henry (1939) · International Journal of American Linguistics. 10 (2/3) ·

Manual de la gramática Chulupí ( pp. 159-248 ) . P. Junker and J. Wilkskamp and J. Seelwische (1968) · Supplemento Antropológico. III

El Choroti o Yófuaha . Hunt, Richard J. (1915) · Henry Young & Sons, Limited