Apéndice bibliográfico (Bibliographic Appendix)

This document is a comprehensive bibliographic appendix containing 267 entries related to the study of Unidentified Aerial Phenomena (UFOs/OVNIs). The list spans a wide range of international literature, including books, journal articles, and monographs published between 1941 and 1997. The bibliography covers diverse aspects of the subject, including historical sightings, military and government reports, abduction accounts, scientific assessments, and sociological studies of the UFO phenomenon. Notable entries include references to the GEPAN-CNES technical notes, the Roswell incident, the Kenneth Arnold sighting of 1947, and various works by prominent ufologists such as Jacques Vallée, J. Allen Hynek, and Antonio Ribera Jordà. The document serves as a reference guide for researchers, documenting both primary source material and analytical works in multiple languages, primarily Spanish, English, and French.