SHEHU, J., and H. NDEE. “Bold First Ascent and Difficult Repeats: A Study of Guides and Porters on Mount Kilimanjaro: 探討登山挑夫的背境”. Asian Journal of Physical Education &Amp; Recreation, vol. 12, no. 2, Dec. 2006, pp. 52-62, doi:10.24112/ajper.121315.