IE Business Cases. African Parks: An NGO in Action Saving Africa's Wilderness. [s.n.].
芝加哥风格引文IE Business Cases. African Parks: An NGO in Action Saving Africa's Wilderness. [S.l.]: [s.n.].
MLA引文IE Business Cases. African Parks: An NGO in Action Saving Africa's Wilderness. [s.n.].
警告：这些引文格式不一定是100％准确.