APA (7th ed.) Citation

Howard, R. E. (1999). Robert E. Howard's Wolfshead. Cross Plains Comics.

Chicago Style (17th ed.) Citation

Howard, Robert E. Robert E. Howard's Wolfshead. New York, N.Y.: Cross Plains Comics, 1999.

MLA (9th ed.) Citation

Howard, Robert E. Robert E. Howard's Wolfshead. Cross Plains Comics, 1999.