Pugwash Conference on Science and World Affairs Rustenburg, South Africa, ebrary, Inc, & Rotblat, J. (2001). Proceedings of the forty-ninth Pugwash Conference on Science and World Affairs, Rustenburg, South Africa, 7-13 September 1999: Confronting the challenges of the 21st century. World Scientific.

Pugwash Conference on Science and World Affairs Rustenburg, South Africa, Inc ebrary, and Joseph Rotblat. Proceedings of the Forty-ninth Pugwash Conference on Science and World Affairs, Rustenburg, South Africa, 7-13 September 1999: Confronting the Challenges of the 21st Century. River Edge, N.J. ; Singapore: World Scientific, 2001.

Pugwash Conference on Science and World Affairs Rustenburg, South Africa, et al. Proceedings of the Forty-ninth Pugwash Conference on Science and World Affairs, Rustenburg, South Africa, 7-13 September 1999: Confronting the Challenges of the 21st Century. World Scientific, 2001.