APA
WHO Scientific Group on Epidemiology E. a. P. o. P. D. (. . M., World Health Organization, . (1978). Epidemiology, etiology, and prevention of periodontal diseases : report of a WHO scientific group [meeting held in Moscow from 23 November to 2 December 1977]. Geneva: World Health Organization.
Chicago
WHO Scientific Group on Epidemiology Etiology and Prevention of Periodontal Diseases (1977 Moscow), World Health Organization, . 1978. Epidemiology, etiology, and prevention of periodontal diseases : report of a WHO scientific group [meeting held in Moscow from 23 November to 2 December 1977]. Geneva: World Health Organization.
Harvard
WHO Scientific Group on Epidemiology E. a. P. o. P. D. (. . M., World Health Organization, . (1978). Epidemiology, etiology, and prevention of periodontal diseases : report of a WHO scientific group [meeting held in Moscow from 23 November to 2 December 1977]. Geneva: World Health Organization.
MLA
WHO Scientific Group on Epidemiology Etiology and Prevention of Periodontal Diseases (1977 Moscow), World Health Organization, . Epidemiology, etiology, and prevention of periodontal diseases : report of a WHO scientific group [meeting held in Moscow from 23 November to 2 December 1977]. Geneva: World Health Organization. 1978.