World Health Organization. Collaborative Study on Breast-feeding. (1981). Contemporary patterns of breast-feeding: Report on the WHO Collaborative Study on Breast-feeding. World Health Organization.
Παραπομπή σε μορφή Chicago (17η εκδ.)World Health Organization. Collaborative Study on Breast-feeding. Contemporary Patterns of Breast-feeding: Report on the WHO Collaborative Study on Breast-feeding. Geneva: World Health Organization, 1981.
Παραπομπή σε μορφή MLA (8th εκδ.)World Health Organization. Collaborative Study on Breast-feeding. Contemporary Patterns of Breast-feeding: Report on the WHO Collaborative Study on Breast-feeding. World Health Organization, 1981.
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