APA引文

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

Chicago Style (17th ed.) Citation

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

MLA引文

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