APA (7th ed.) Citation

Tolkien, J. R. R., & Howe, J. (1993). Tolkien's Middle-earth: A book of 20 postcards. HarperCollins Publishers.

Chicago Style (17th ed.) Citation

Tolkien, J. R. R., and John Howe. Tolkien's Middle-earth: A Book of 20 Postcards. Hammersmith, London: HarperCollins Publishers, 1993.

MLA (8th ed.) Citation

Tolkien, J. R. R., and John Howe. Tolkien's Middle-earth: A Book of 20 Postcards. HarperCollins Publishers, 1993.