APA (7th ed.) Citation

Perez, G., & Gray, E. (1902). Marianela. American Book.

Chicago Style (17th ed.) Citation

Perez, Galdos, and Edward Gray. Marianela. New York: American Book, 1902.

MLA (9th ed.) Citation

Perez, Galdos, and Edward Gray. Marianela. American Book, 1902.