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.
Lua i Stíl Chicago (17ú heag.)World Health Organization agus 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.
Lua MLA (8ú heag.)World Health Organization agus 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.