Langley, R. (1991). Signs of the time... Apparitions, visions, locutions conderning the last times. Marian Center.
Chicago-referens (17:e uppl.)Langley, Richard. Signs of the Time... Apparitions, Visions, Locutions Conderning the Last Times. Waterloo, IA: Marian Center, 1991.
MLA-referens (8:e uppl.)Langley, Richard. Signs of the Time... Apparitions, Visions, Locutions Conderning the Last Times. Marian Center, 1991.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.