Sri Lanka. Dept. of Geological Survey. Administration reports of the Director of Geological Survey. Dept. of Geological Survey].
Chicago Style (17. basım) AtıfSri Lanka. Dept. of Geological Survey. Administration Reports of the Director of Geological Survey. [Colombo: Dept. of Geological Survey].
MLA (8th ed.) AtıfSri Lanka. Dept. of Geological Survey. Administration Reports of the Director of Geological Survey. Dept. of Geological Survey].
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