APA (7th ed.) Citation

Lovecraft, H. P., & Derleth, A. W. (1973). The lurker at the threshold (Repr.). Panther Books.

Chicago Style (17th ed.) Citation

Lovecraft, H. P., and August William Derleth. The Lurker at the Threshold. Repr. London: Panther Books, 1973.

MLA (9th ed.) Citation

Lovecraft, H. P., and August William Derleth. The Lurker at the Threshold. Repr. Panther Books, 1973.