International Geological Correlation Programme. Project 156 Phosphorites. (1981). Newsletter of the International Geological Correlation Programme. The Project.
Citace podle Chicago (17th ed.)International Geological Correlation Programme. Project 156 Phosphorites. Newsletter of the International Geological Correlation Programme. London: The Project, 1981.
Citace podle MLA (8th ed.)International Geological Correlation Programme. Project 156 Phosphorites. Newsletter of the International Geological Correlation Programme. The Project, 1981.
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