Leitch, I., & Billewicz, W. Z. (1963). A scheme for classification of information on nutrition coded for machine retrieval. Commonwealth Agricultural Bureaux.
Chicago-referens (17:e uppl.)Leitch, Isabella, och Władysław Zbigniew Billewicz. A Scheme for Classification of Information on Nutrition Coded for Machine Retrieval. Farnham Royal, Slough, Bucks,: Commonwealth Agricultural Bureaux, 1963.
MLA-referens (8:e uppl.)Leitch, Isabella, och Władysław Zbigniew Billewicz. A Scheme for Classification of Information on Nutrition Coded for Machine Retrieval. Commonwealth Agricultural Bureaux, 1963.
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