APA način citiranja

López Herrera, G., Quesada Quirós, L., & Guerrero Blanco, L. A. (2017). Alexa vs. Siri vs. Cortana vs. Google Assistant: A Comparison of Speech-Based Natural User Interfaces.

Čikaški stil citiranja

López Herrera, Gustavo, Luis Quesada Quirós, i Luis Alberto Guerrero Blanco. Alexa Vs. Siri Vs. Cortana Vs. Google Assistant: A Comparison of Speech-Based Natural User Interfaces. 2017.

MLA način citiranja

López Herrera, Gustavo, Luis Quesada Quirós, i Luis Alberto Guerrero Blanco. Alexa Vs. Siri Vs. Cortana Vs. Google Assistant: A Comparison of Speech-Based Natural User Interfaces. 2017.