APA
Pan American Health Organization, World Health Organization, . (1959). First international conference on live poliovirus vaccines: Science publication No - 44. Washington: Pan American Health Organization.
Chicago
Pan American Health Organization, World Health Organization, . 1959. First international conference on live poliovirus vaccines: Science publication No - 44. Washington: Pan American Health Organization.
Harvard
Pan American Health Organization, World Health Organization, . (1959). First international conference on live poliovirus vaccines: Science publication No - 44. Washington: Pan American Health Organization.
MLA
Pan American Health Organization, World Health Organization, . First international conference on live poliovirus vaccines: Science publication No - 44. Washington: Pan American Health Organization. 1959.