APA (7th ed.) Citation

Pollard, A., & Clarke, C. (1988). Deaths during mountaineering at extreme altitude.

Chicago Style (17th ed.) Citation

Pollard, A., and C. Clarke. Deaths During Mountaineering at Extreme Altitude. 1988.

MLA (9th ed.) Citation

Pollard, A., and C. Clarke. Deaths During Mountaineering at Extreme Altitude. 1988.

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