APA (7th ed.) Citation

Billias, S. (1988). Deryni challenge. Tom Doherty Associates.

Chicago Style (17th ed.) Citation

Billias, Stephen. Deryni Challenge. New York: Tom Doherty Associates, 1988.

MLA (9th ed.) Citation

Billias, Stephen. Deryni Challenge. Tom Doherty Associates, 1988.

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