Harper, M., Carballo V., G., & Sandí Sandí, M. (1997). Twenty years of the Foundation of the School of Library, Documentation and Information of the National University Intellectual Property in Costa Rica - The information technology environment.
استشهاد بنمط شيكاغوHarper, Marlene, Guishelle Carballo V., و Magda Sandí Sandí. Twenty Years of the Foundation of the School of Library, Documentation and Information of the National University Intellectual Property in Costa Rica - The Information Technology Environment. 1997.
MLA استشهادHarper, Marlene, Guishelle Carballo V., و Magda Sandí Sandí. Twenty Years of the Foundation of the School of Library, Documentation and Information of the National University Intellectual Property in Costa Rica - The Information Technology Environment. 1997.