Aikhenvald, Alexandra Y. (2008). "Multilingual Imperatives: The Elaboration of a Category in Northwest Amazonia". International Journal of American Linguistics. 74 (2): 189–225. doi:10.1086/587704. JSTOR10.1086/587704. S2CID23636638.
Piggott, G. L. (1992-01-01). "Variability in Feature Dependency: The Case of Nasality". Natural Language & Linguistic Theory. 10 (1): 33–77. doi:10.1007/bf00135358. JSTOR4047766. S2CID170750814.
Aikhenvald, Alexandra Y. (2008). "Multilingual Imperatives: The Elaboration of a Category in Northwest Amazonia". International Journal of American Linguistics. 74 (2): 189–225. doi:10.1086/587704. JSTOR10.1086/587704. S2CID23636638.
Piggott, G. L. (1992-01-01). "Variability in Feature Dependency: The Case of Nasality". Natural Language & Linguistic Theory. 10 (1): 33–77. doi:10.1007/bf00135358. JSTOR4047766. S2CID170750814.
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Aikhenvald, Alexandra Y. (2008). "Multilingual Imperatives: The Elaboration of a Category in Northwest Amazonia". International Journal of American Linguistics. 74 (2): 189–225. doi:10.1086/587704. JSTOR10.1086/587704. S2CID23636638.
Piggott, G. L. (1992-01-01). "Variability in Feature Dependency: The Case of Nasality". Natural Language & Linguistic Theory. 10 (1): 33–77. doi:10.1007/bf00135358. JSTOR4047766. S2CID170750814.