Schulze, W. (1973). A new geography of Liberia. Longman group.
Chicagoスタイル(17版)引用形式Schulze, Willi. A New Geography of Liberia. London: Longman group, 1973.
MLA(9版)引用形式Schulze, Willi. A New Geography of Liberia. Longman group, 1973.
警告: この引用は必ずしも正確ではありません.