Sorgenfrei T. Theodor. (1961). International Geological Congress. Report of the Twenty- First Session. Norden Denmark. Finland. Iceland. Norway. Sweden 1960. Copenhagen, Det Berlingske Bogtrykkeri, 1961.
Chicago Style (17th ed.) CitationSorgenfrei T. Theodor. International Geological Congress. Report of the Twenty- First Session. Norden Denmark. Finland. Iceland. Norway. Sweden 1960. Copenhagen, Det Berlingske Bogtrykkeri, 1961, 1961.
MLA (9th ed.) CitationSorgenfrei T. Theodor. International Geological Congress. Report of the Twenty- First Session. Norden Denmark. Finland. Iceland. Norway. Sweden 1960. Copenhagen, Det Berlingske Bogtrykkeri, 1961, 1961.
Warning: These citations may not always be 100% accurate.