World Health Organization. (1998). Health 21: Health for all in the 21st century. World Health Organization.
Cita Chicago (17th ed.)World Health Organization. Health 21: Health for All in the 21st Century. Denmark: World Health Organization, 1998.
Cita MLA (8th ed.)World Health Organization. Health 21: Health for All in the 21st Century. World Health Organization, 1998.
Atenció: Aquestes cites poden no estar 100% correctes.