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.
Chicago-tyylinen lähdeviittausHarper, Marlene, Guishelle Carballo V., ja 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-viiteHarper, Marlene, Guishelle Carballo V., ja 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.