APA aipamena

Khalil, A. A. R. (1990). Genesis and ecology of the vertisols of Eastern Sudan. Christian-Albrechts-Universitat zu Kiel.

Chicago Style aipamena

Khalil, Ahmed Abdel Raouf. Genesis and Ecology of the Vertisols of Eastern Sudan. Kiel: Christian-Albrechts-Universitat zu Kiel, 1990.

MLA aipamena

Khalil, Ahmed Abdel Raouf. Genesis and Ecology of the Vertisols of Eastern Sudan. Christian-Albrechts-Universitat zu Kiel, 1990.