Wirtz, VJ; Hogerzeil, HV; Gray, AL; Bigdeli, M; de Joncheere, CP και άλλοι. (28 January 2017). «Essential medicines for universal health coverage». The Lancet389 (10067): 403–476. doi:10.1016/S0140-6736(16)31599-9. PMID27832874.
Wirtz, VJ; Hogerzeil, HV; Gray, AL; Bigdeli, M; de Joncheere, CP και άλλοι. (28 January 2017). «Essential medicines for universal health coverage». The Lancet389 (10067): 403–476. doi:10.1016/S0140-6736(16)31599-9. PMID27832874.