1. World Health Organisation (1980) Laboratory manual for the examination of human semen and sperm-cervical mucus interactions. Press Concern, Singapore
2. World Health Organisation (1987) Laboratory manual for the examination of human semen and sperm-cervical mucus interactions, 2nd edn. The Press Syndicate of the University of Cambridge, Cambridge, UK
3. World Health Organisation (1992) Laboratory manual for the examination of human semen and sperm-cervical mucus interactions, 3rd edn. Cambridge University Press, Cambridge, UK
4. World Health Organisation (1999) Laboratory manual for the examination of human semen and sperm-cervical mucus interactions, 4th edn. Cambridge University Press, Cambridge, UK
5. World Health Organisation (2010) Laboratory manual for the examination and processing of human semen, 5th edn. Cambridge University Press, Cambridge, UK