APA (7th ed.) Citation

Wetter, O., & Pfister, C. (2013). An underestimated record breaking event – why summer 1540 was likely warmer than 2003. Copernicus Publications.

Chicago Style (17th ed.) Citation

Wetter, O., and C. Pfister. An Underestimated Record Breaking Event – Why Summer 1540 Was Likely Warmer than 2003. Copernicus Publications, 2013.

MLA (9th ed.) Citation

Wetter, O., and C. Pfister. An Underestimated Record Breaking Event – Why Summer 1540 Was Likely Warmer than 2003. Copernicus Publications, 2013.

Warning: These citations may not always be 100% accurate.