APA

PAN AMERICAN HEALTH ORGANIZATION, . (1971). PAHO, what it is, what it does, how it works. Washington: Pan American Sanitary Bureau.

Chicago

PAN AMERICAN HEALTH ORGANIZATION, . 1971. PAHO, what it is, what it does, how it works. Washington: Pan American Sanitary Bureau.

Harvard

PAN AMERICAN HEALTH ORGANIZATION, . (1971). PAHO, what it is, what it does, how it works. Washington: Pan American Sanitary Bureau.

MLA

PAN AMERICAN HEALTH ORGANIZATION, . PAHO, what it is, what it does, how it works. Washington: Pan American Sanitary Bureau. 1971.