APA (7th ed.) Citation

O'Connor, P. W. (1977). Gregorio and Maria Martinez Sierra. Twayne Publishers.

Chicago Style (17th ed.) Citation

O'Connor, Patricia W. Gregorio and Maria Martinez Sierra. Boston: Twayne Publishers, 1977.

MLA (9th ed.) Citation

O'Connor, Patricia W. Gregorio and Maria Martinez Sierra. Twayne Publishers, 1977.

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