APA (7th ed.) Citation

Gamboa, S., & Curtis, H. (2017). Return to the Dark Valley. Europa Editions.

Chicago Style (17th ed.) Citation

Gamboa, Santiago, and Howard Curtis. Return to the Dark Valley. New York: Europa Editions, 2017.

MLA (9th ed.) Citation

Gamboa, Santiago, and Howard Curtis. Return to the Dark Valley. Europa Editions, 2017.