Johnson, R. (1981). Food safety services. Copenhagen: World Health Organization. Regional office for Europe.
Παραπομπή Chicago StyleJohnson, R. Food Safety Services. Copenhagen: World Health Organization. Regional office for Europe, 1981.
Παραπομπή MLAJohnson, R. Food Safety Services. Copenhagen: World Health Organization. Regional office for Europe, 1981.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.