APA (7th ed.) Citation

Nowlan, P. F. Armageddon—2419 A.D.

Chicago Style (17th ed.) Citation

Nowlan, Philip Francis. Armageddon—2419 A.D.

MLA (9th ed.) Citation

Nowlan, Philip Francis. Armageddon—2419 A.D.

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