APA (7th ed.) Citation

Youman, I., & Argudo Vicuña, R. What is english? it´s the task of a happy youngster.

Chicago Style (17th ed.) Citation

Youman, Ion, and Rafael Argudo Vicuña. What Is English? It´s the Task of a Happy Youngster.

MLA (8th ed.) Citation

Youman, Ion, and Rafael Argudo Vicuña. What Is English? It´s the Task of a Happy Youngster.

Warning: These citations may not always be 100% accurate.