APA (7th ed.) Citation

Madrigal, M., & Warhol, A. (2001). Madrigal's magic key to Spanish. Broadway Books.

Chicago Style (17th ed.) Citation

Madrigal, Margarita, and Andy Warhol. Madrigal's Magic Key to Spanish. New York, USA: Broadway Books, 2001.

MLA (9th ed.) Citation

Madrigal, Margarita, and Andy Warhol. Madrigal's Magic Key to Spanish. Broadway Books, 2001.