World Health Organization. Regional Office for Europe & Offerhaus, L. (1997). Drugs for the elderly (2nd ed.). World Health Organization, Regional Office for Europe.
Παραπομπή σε μορφή Chicago (17η εκδ.)World Health Organization. Regional Office for Europe και L. Offerhaus. Drugs for the Elderly. 2nd ed. Copenhagen: World Health Organization, Regional Office for Europe, 1997.
Παραπομπή σε μορφή MLA (8th εκδ.)World Health Organization. Regional Office for Europe και L. Offerhaus. Drugs for the Elderly. 2nd ed. World Health Organization, Regional Office for Europe, 1997.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.