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2. WHO Expert Committee on Biological Standardization Fifteenth report;World Health Organization Technical Report Series,1963
3. Bowmer EJ. Antitoxins of Clostridium botulinum types A, B, C, D and E. Preparation and assay of proposed International Standards. Faculty of Medicine University of Liverpool. MD thesis; 1962. p. 1–108.
4. WHO Expert Committee on Biological Standardization Sixteenth report;World Health Organization Technical Report Series,1964
5. WHO Expert Committee on Biological Standardization Eighteenth report;World Health Organization Technical Report Series,1966