Khalil, A. A. R. (1990). Genesis and ecology of the vertisols of Eastern Sudan. Christian-Albrechts-Universitat zu Kiel.
Chicagoスタイル(17版)引用形式Khalil, Ahmed Abdel Raouf. Genesis and Ecology of the Vertisols of Eastern Sudan. Kiel: Christian-Albrechts-Universitat zu Kiel, 1990.
MLA(8版)引用形式Khalil, Ahmed Abdel Raouf. Genesis and Ecology of the Vertisols of Eastern Sudan. Christian-Albrechts-Universitat zu Kiel, 1990.
警告: この引用は必ずしも正確ではありません.