APA (7th ed.) Citation

International Geological Congress & Sorgenfrei, T. (1960). Report of the twenty-first session, Norden: Denmark, Finland, Iceland, Norway, Sweden, 1960. Berlingske bogtrykkeri.

Chicago Style (17th ed.) Citation

International Geological Congress and Theodor Sorgenfrei. Report of the Twenty-first Session, Norden: Denmark, Finland, Iceland, Norway, Sweden, 1960. Copenhagen: Berlingske bogtrykkeri, 1960.

MLA (9th ed.) Citation

International Geological Congress and Theodor Sorgenfrei. Report of the Twenty-first Session, Norden: Denmark, Finland, Iceland, Norway, Sweden, 1960. Berlingske bogtrykkeri, 1960.