1. Medical Specimen Containersfor Haematology and Biochemistry: BS 4851;British Standards Institution,1972
2. The collection of specimens and choice of containers with special reference to leakage and aerosol tests;Cook, I.J.Y.;Medical Technologist,1972
3. Medical specimen containers up to 25 ml capacity. Second specification working draft,1977
4. Evacuated tubes for blood specimen collection. First working draft;International Standards Organisation; specification,1977
5. Standard for evacuated tubes for specimen collection;US National Committee for Clinical Laboratory Standards,1977