APA
Pan American Health Organization, World Health Organization, . (1971). International conference on the application of vaccines against viral, rickettsial and bacterial diseases of man 14-18 december 1970: scientific publication No.226. Washington: Pan American Health Organization.
Chicago
Pan American Health Organization, World Health Organization, . 1971. International conference on the application of vaccines against viral, rickettsial and bacterial diseases of man 14-18 december 1970: scientific publication No.226. Washington: Pan American Health Organization.
Harvard
Pan American Health Organization, World Health Organization, . (1971). International conference on the application of vaccines against viral, rickettsial and bacterial diseases of man 14-18 december 1970: scientific publication No.226. Washington: Pan American Health Organization.
MLA
Pan American Health Organization, World Health Organization, . International conference on the application of vaccines against viral, rickettsial and bacterial diseases of man 14-18 december 1970: scientific publication No.226. Washington: Pan American Health Organization. 1971.