APA način citiranja

Vega, O. A., & Vinasco-Salazar, R. E. (2014). CAPTCHA: A solution for computer security or a problem to access/ use the web?

Čikaški stil citiranja

Vega, Omar Antonio, i Ronald Eduardo Vinasco-Salazar. CAPTCHA: A Solution for Computer Security or a Problem to Access/ Use the Web? 2014.

MLA način citiranja

Vega, Omar Antonio, i Ronald Eduardo Vinasco-Salazar. CAPTCHA: A Solution for Computer Security or a Problem to Access/ Use the Web? 2014.