(1961). Part 26: Supplementary Volume. Proceedings of section 1-21; International Geological Congress. Report of the Twenty- First Session. Norden Denmark. Finland. Iceland. Norway. Sweden 1960. 1961.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিPart 26: Supplementary Volume. Proceedings of Section 1-21; International Geological Congress. Report of the Twenty- First Session. Norden Denmark. Finland. Iceland. Norway. Sweden 1960. 1961, 1961.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিPart 26: Supplementary Volume. Proceedings of Section 1-21; International Geological Congress. Report of the Twenty- First Session. Norden Denmark. Finland. Iceland. Norway. Sweden 1960. 1961, 1961.
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