APA (7th ed.) Citation

Serrano, J., & Serrano, S. (1992). Spanish verbs ser and estar: Key to mastering the language. Hippocrene Books.

Chicago Style (17th ed.) Citation

Serrano, Juan, and Susan Serrano. Spanish Verbs Ser and Estar: Key to Mastering the Language. New York: Hippocrene Books, 1992.

MLA (9th ed.) Citation

Serrano, Juan, and Susan Serrano. Spanish Verbs Ser and Estar: Key to Mastering the Language. Hippocrene Books, 1992.

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