APA (7 वां संस्करण) प्रशस्ति पत्र

Montgomery, C. W. (1991). Earth, then and now. Wm. C. Brown.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Montgomery, Carla W. Earth, Then and Now. Dubuque, IA: Wm. C. Brown, 1991.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

Montgomery, Carla W. Earth, Then and Now. Wm. C. Brown, 1991.