Christensen, J. M. (1980). Seashells: Bivalves of the British and northern European seas. Penguin.
शिकागो स्टाइल उद्धरणChristensen, J. Moller. Seashells: Bivalves of the British and Northern European Seas. England: Penguin, 1980.
एमएलए उद्धरणChristensen, J. Moller. Seashells: Bivalves of the British and Northern European Seas. Penguin, 1980.
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