Campbell, Lyle (Ed.) and Verónica Grondona (Ed.). Volume 2 The Indigenous Languages of South America. A Comprehensive Guide. Berlin, Boston: De Gruyter Mouton, 2012. Web. Retrieved 19 Jun. 2013, from http://www.degruyter.com/view/product/20817

Campbell, . (Ed.) & Grondona, V. (Ed.) (2012). Volume 2 The Indigenous Languages of South America. A Comprehensive Guide. Berlin, Boston: De Gruyter Mouton. Retrieved 19 Jun. 2013, from http://www.degruyter.com/view/product/20817

Campbell, Lyle (Ed.) and Verónica Grondona (Ed.). 2012. Volume 2 The Indigenous Languages of South America. A Comprehensive Guide. Berlin, Boston: De Gruyter Mouton. Retrieved 19 Jun. 2013, from http://www.degruyter.com/view/product/20817