Leon, R. T., LinkYoud, T. L., & Santana Barboza, G. (1993). Proceedings of the NSF/UCR U.S.-Costa Rica Workshop on the Costa Rica Earthquakes of 1990-1991: Effects on soils and structures.

Leon, Roberto T., T. Leslie LinkYoud, and Guillermo Santana Barboza. Proceedings of the NSF/UCR U.S.-Costa Rica Workshop on the Costa Rica Earthquakes of 1990-1991: Effects on Soils and Structures. Oakland, Calf : Earthquake Engineering Research Institute, 1993.

Leon, Roberto T., et al. Proceedings of the NSF/UCR U.S.-Costa Rica Workshop on the Costa Rica Earthquakes of 1990-1991: Effects on Soils and Structures. 1993.