APA (7th ed.) Citation

Lovecraft, H. P., Derleth, A., & Wandrei, D. (1965). Selected letters. Arkham House.

Chicago Style (17th ed.) Citation

Lovecraft, H. P., August Derleth, and Donald Wandrei. Selected Letters. Sauk City, Wis.: Arkham House, 1965.

MLA (9th ed.) Citation

Lovecraft, H. P., et al. Selected Letters. Arkham House, 1965.