Citação norma APA

(1997). Vitamin A Supplements: A Guide to their Use in the Treatment and Prevention of Vitamin A Deficiency and Xerophthalmia (2nd.). World Health Organisation.

Citação norma Chicago

Vitamin A Supplements: A Guide to Their Use in the Treatment and Prevention of Vitamin A Deficiency and Xerophthalmia. 2nd. Geneva: World Health Organisation, 1997.

Citação norma MLA

Vitamin A Supplements: A Guide to Their Use in the Treatment and Prevention of Vitamin A Deficiency and Xerophthalmia. 2nd. World Health Organisation, 1997.

Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.