APA (7th ed.) Citation

Gunn, J. (2000). The years without summer: Tracing A.D. 536 and its aftermath. Archaeopress.

Chicago Style (17th ed.) Citation

Gunn, Joel. The Years Without Summer: Tracing A.D. 536 and Its Aftermath. Oxford, England: Archaeopress, 2000.

MLA (9th ed.) Citation

Gunn, Joel. The Years Without Summer: Tracing A.D. 536 and Its Aftermath. Archaeopress, 2000.