World Health Organization & Tufts University. School of Nutrition Science and Policy. (2002). Keep fit for life: Meeting the nutritional needs of older persons. World Health Organization Tufts University, School of Nutrition and Policy.
Παραπομπή σε μορφή Chicago (17η εκδ.)World Health Organization και Tufts University. School of Nutrition Science and Policy. Keep Fit for Life: Meeting the Nutritional Needs of Older Persons. Geneva [Medford, Mass.]: World Health Organization Tufts University, School of Nutrition and Policy, 2002.
Παραπομπή σε μορφή MLA (8th εκδ.)World Health Organization και Tufts University. School of Nutrition Science and Policy. Keep Fit for Life: Meeting the Nutritional Needs of Older Persons. World Health Organization Tufts University, School of Nutrition and Policy, 2002.