1. Ellenberg, H.: International Biological Programme. Contributions of the Federal Republic of Germany. Bad Godesberg: German Research Association 1967.
2. Ellenberg, H., Ovington, J. D.: International Biological Programme of the International Council of Scientific Unions. Project A I: Productivity of Terrestrial Communities — Ecology. Ber. Geobot. Inst. ETH, Stiftg. Rübel, Zürich, 35, 29–40 (1964).
3. IBP News. Ed. by IBP Central Office 1964–1969 (20 numbers).