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↑ "Government Of The Republic Of Liberia, 2008 National Population And Housing Census", リベリア統計地理情報局。
↑ Maryland Historical Society Library: Harper-Pennington Papers, 1701-1899, MS. 431
1 2 Doctors without Borders in Harper, Liberia
↑ Government of the Republic of Liberia, Executive mansion
↑ allAfrica.com: President Sirleaf's South-Eastern Tour Kicks-Off
↑ allAfrica.com: U.S. Gov't Unveils Rehabilitated Harper City Hall, Administrative Building
座標: 北緯4度22分 西経7度43分 / 北緯4.367度 西経7.717度 / 4.367; -7.717