Relativity Meeting--91 Bilboa, Spain, Feinstein, A., & Ibanez, J. (1992). Recent developments in gravitation: Proceedings of the Relativity Meeting 91, 9-12 September 1991, Bilbao, Spain. World Scientific.
Chicago Style (17th ed.) CitationRelativity Meeting--91 Bilboa, Spain, A. Feinstein, and J. Ibanez. Recent Developments in Gravitation: Proceedings of the Relativity Meeting 91, 9-12 September 1991, Bilbao, Spain. Singapore ; River Edge, NJ: World Scientific, 1992.
MLA (9th ed.) CitationRelativity Meeting--91 Bilboa, Spain, et al. Recent Developments in Gravitation: Proceedings of the Relativity Meeting 91, 9-12 September 1991, Bilbao, Spain. World Scientific, 1992.
Warning: These citations may not always be 100% accurate.