Pollard, A., & Clarke, C. (1988). Deaths during mountaineering at extreme altitude.
Cita Chicago Style (17a ed.)Pollard, A., y C. Clarke. Deaths During Mountaineering at Extreme Altitude. 1988.
Cita MLA (9a ed.)Pollard, A., y C. Clarke. Deaths During Mountaineering at Extreme Altitude. 1988.
Precaución: Estas citas no son 100% exactas.