1. Ali, O. M., 1977. Hydrophytic plants from the southern stretches of the White Nile. Report of the Jonglei Canal Project Mission. Hydrobiological Research Unit Report, University of Khartoum (mimeographed).
2. Ali, O. M., 1990. An Ecological Assessment of the Nile System in the Sudan over the Last Thirty Years. Nile Geographer 1: 1–9.
3. Andrews, F. W., 1945. Water plants in the Gezira canals. A study of aquatic plants and their control in the canals of the Gezira cotton area (Anglo-Egyptian Sudan). Annals of Applied Biology 32: 1–14.
4. Andrews, F. W., 1952. The Flowering Plants of the Anglo-Egyptian Sudan I. Sudan Government Publication, Buncle & Co. LTD, Arbroath, Scotland, 237 pp.
5. Andrews, F. W., 1954. The Flowering Plants of the Anglo-Egyptian Sudan II. Sudan Government Publication, 485 pp.