J. Allen Hynek - The Hynek UFO Report (1977)
Mufon ufo journal 1975 12. december - skylook
Mufon ufo journal 1974 3. march - skylook
Mufon ufo journal 1976 4. april - skylook
Project blue book ufo part 1 of 1
UFO Newspaper/Magazine Cuttings from NSW Australia - May 2010 to September 2011
Journal of Scientific Exploration, Volume 27, Issue 2
Bbltk-m.a.o. Lp-330 the Hynek Ufo Report - Vicufo
FBI, Proyecto Libro Azul (UFO)
MUFON UFO Journal - 1976 4. April - Skylook
MUFON UFO Journal - 1975 12. December - Skylook