Underwood, E. J. (1956). Trace elements in human and animal nutrition. Academic Press Inc.
Lua i Stíl Chicago (17ú heag.)Underwood, Eric J. Trace Elements in Human and Animal Nutrition. New York: Academic Press Inc, 1956.
Lua MLA (9ú heag.)Underwood, Eric J. Trace Elements in Human and Animal Nutrition. Academic Press Inc, 1956.
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