APA (7 वां संस्करण) प्रशस्ति पत्र

Langley, R. (1991). Signs of the time... Apparitions, visions, locutions conderning the last times. Marian Center.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Langley, Richard. Signs of the Time... Apparitions, Visions, Locutions Conderning the Last Times. Waterloo, IA: Marian Center, 1991.

एमएलए (8वां संस्करण) प्रशस्ति पत्र

Langley, Richard. Signs of the Time... Apparitions, Visions, Locutions Conderning the Last Times. Marian Center, 1991.