International Astronomical Union. Symposium, Hewitt, A., Burbidge, G. R., & Fang, L. (1987). Observational cosmology: Proceedings of the 124th Symposium of the International Astronomical Union, held in Beijing, China, August 25-30, 1986. D. Reidel ; Distributed in the U.S.A. and Canada by Kluwer Academic Publishers.

International Astronomical Union. Symposium, Adelaide Hewitt, Geoffrey R. Burbidge, and Li-chih Fang. Observational Cosmology: Proceedings of the 124th Symposium of the International Astronomical Union, Held in Beijing, China, August 25-30, 1986. Dordrecht ; Boston : Norwell, MA, U.S.A.: D. Reidel ; Distributed in the U.S.A. and Canada by Kluwer Academic Publishers, 1987.

International Astronomical Union. Symposium, et al. Observational Cosmology: Proceedings of the 124th Symposium of the International Astronomical Union, Held in Beijing, China, August 25-30, 1986. D. Reidel ; Distributed in the U.S.A. and Canada by Kluwer Academic Publishers, 1987.