1. Astley, D. (1979) Solanum sucrense Hawkes — a clarification, in Proceedings of the Conference on Broadening the Genetic Base of Crops, Wageningen (eds A.C. Zeven and A.M. van Harten), Pudoc, Wageningen, pp. 233–5.
2. Astley, D. and Hawkes, J.G. (1979) The nature of the Bolivian weed potato species Solanum sucrense Hawkes. Euphytica, 28, 685–96.
3. CIP (1972) Prospects for the Potato in the Developing World, International Potato Center, Lima, Peru.
4. CIP (1974–1990) Annual Reports, International Potato Center, Lima, Peru.
5. CIP (1983) Research for the Potato in the Year 2000. Tenth Anniversary, 1972–1982,