@inbook{19158,
  author = {Ivers R. and H. Viet Dang and World Health Organization and Jan Stephen},
  title = {How to assess the impact of the programme. Module 6},
  year = {2006},
  journal = {Helmets: how to implement and evaluate interventions },
  publisher = {World Health Organization},
  address = {Geneva},
  language = {eng},
}