Clark, D. W. (1981). Preventive and community medicine (2ª ed.). Little, Brown.
Chicago-čujuhus (17. p.)Clark, Duncan W. Preventive and Community Medicine. 2ª ed. Little, Brown, 1981.
MLA-čujuhus (9. p.)Clark, Duncan W. Preventive and Community Medicine. 2ª ed. Little, Brown, 1981.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.