APA-ийн эшлэл(7 дахь хэвлэлт)
Buel, J. W. (1889). Heroes of the Dark Continent: A complete history of all the great explorations and discoveries in Africa, from the earliest ages to the present time. North American Publishing Co..
Чикаго-гийн эшлэл (17 дахь хэвлэлт)
Buel, James W. Heroes of the Dark Continent: A Complete History of All the Great Explorations and Discoveries in Africa, from the Earliest Ages to the Present Time. St. Louis: North American Publishing Co., 1889.
MLA -ийн эшлэл (9 дэх хэвлэлт)
Buel, James W. Heroes of the Dark Continent: A Complete History of All the Great Explorations and Discoveries in Africa, from the Earliest Ages to the Present Time. North American Publishing Co., 1889.
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