Bernal Chávez, J. A., & Díaz Romero, C. E. (2017). Panoramic Characterization of Spanish Spoken in Colombia: Phonology and Grammar. Universidad Pedagógica y Tecnológica de Colombia.
Čikaški stil citiranja (17. izdanje)Bernal Chávez, Julio Alexander, i Camilo Enrique Díaz Romero. Panoramic Characterization of Spanish Spoken in Colombia: Phonology and Grammar. Universidad Pedagógica y Tecnológica de Colombia, 2017.
MLA način citiranja (9. izdanje)Bernal Chávez, Julio Alexander, i Camilo Enrique Díaz Romero. Panoramic Characterization of Spanish Spoken in Colombia: Phonology and Grammar. Universidad Pedagógica y Tecnológica de Colombia, 2017.
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