Pollard, A., & Clarke, C. (1988). Deaths during mountaineering at extreme altitude.
Citace podle Chicago (17th ed.)Pollard, A., a C. Clarke. Deaths During Mountaineering at Extreme Altitude. 1988.
Citace podle MLA (9th ed.)Pollard, A., a C. Clarke. Deaths During Mountaineering at Extreme Altitude. 1988.
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