Volodin, Aleksandr P. 2001. "Imperative in Kerek." In Typology of Imperative Constructions, edited by Viktor S. Xrakovskij. 145-158. Lincom Europa.
Vittadello, Alberto. 1988. "Cha'palaachi = El Idioma Cayapa." 5: Pontificia Universidad Catolica del Ecuador, Sede de Esmeraldas / Museos del Banco Central del Ecuador.
Vaxtin, Nikolaj B. 2001. "Imperative Sentences in Asiatic Eskimo." In Typology of Imperative Constructions, edited by Victor S. Xrakovskij. 129-144. Lincom Europa.
Stegnij, Viktor A. 2001. "Imperative Constructions in Klamath." In Typology of Imperative Constructions, edited by Victor S. Xrakovskij. 78-97. Lincom Europa.