APA (7 वां संस्करण) प्रशस्ति पत्र

Fredén, C. (1988). Marine life and deglaciation chronology of the Vänern Basin, southwestern Sweden. Sveriges geologiska undersökning.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Fredén, Curt. Marine Life and Deglaciation Chronology of the Vänern Basin, Southwestern Sweden. Uppsala: Sveriges geologiska undersökning, 1988.

एमएलए (8वां संस्करण) प्रशस्ति पत्र

Fredén, Curt. Marine Life and Deglaciation Chronology of the Vänern Basin, Southwestern Sweden. Sveriges geologiska undersökning, 1988.