Pollard, A., & Clarke, C. (1988). Deaths during mountaineering at extreme altitude.
芝加哥风格引文Pollard, A., 与 C. Clarke. Deaths During Mountaineering at Extreme Altitude. 1988.
MLA引文Pollard, A., 与 C. Clarke. Deaths During Mountaineering at Extreme Altitude. 1988.
警告：这些引文格式不一定是100％准确.