Sanchez A., Olga Castro G. and Reinaldo Binder. 1977. "Una Gramática Pedagógica Del Waunana." 3: Instituto Nacional de Cultura, Dirección del Patrimonio Histórico; Instituto Lingüı.
Polinsky, Maria S. 2001. "Imperative and Other Means of Expressing Exhortation in Maori." In Typology of Imperative Constructions, edited by Victor S. Xrakovski. 404-420. Lincom Europa.
Mortensen, C. 1999. "A Reference Grammar of Northern Embera Languages." 7: Summer Institute of Linguistics and The University of Texas at Arlington.