APA (7th ed.) Citation

World Health Organization & World Health Organization. Aged Population, principles for evaluating the effects of chemicals.

Chicago Style (17th ed.) Citation

World Health Organization and World Health Organization. Aged Population, Principles for Evaluating the Effects of Chemicals.

MLA (8th ed.) Citation

World Health Organization and World Health Organization. Aged Population, Principles for Evaluating the Effects of Chemicals.

Warning: These citations may not always be 100% accurate.