(1961). Part 24: Proceedings of the International Committee for the Study of Clays; International Geological Congress. Report of the Twenty- First Session. Norden Denmark. Finland. Iceland. Norway. Sweden 1960. Copenhagen, Det Berlingske Bogtrykkeri, 1961.
Παραπομπή σε μορφή Chicago (17η εκδ.)Part 24: Proceedings of the International Committee for the Study of Clays; International Geological Congress. Report of the Twenty- First Session. Norden Denmark. Finland. Iceland. Norway. Sweden 1960. Copenhagen, Det Berlingske Bogtrykkeri, 1961, 1961.
Παραπομπή σε μορφή MLA (9th εκδ.)Part 24: Proceedings of the International Committee for the Study of Clays; International Geological Congress. Report of the Twenty- First Session. Norden Denmark. Finland. Iceland. Norway. Sweden 1960. Copenhagen, Det Berlingske Bogtrykkeri, 1961, 1961.