Leitch, I., & Billewicz, W. Z. (1963). A scheme for classification of information on nutrition coded for machine retrieval. Commonwealth Agricultural Bureaux.
Cita Chicago (17th ed.)Leitch, Isabella, i Władysław Zbigniew Billewicz. A Scheme for Classification of Information on Nutrition Coded for Machine Retrieval. Farnham Royal, Slough, Bucks,: Commonwealth Agricultural Bureaux, 1963.
Cita MLA (8th ed.)Leitch, Isabella, i Władysław Zbigniew Billewicz. A Scheme for Classification of Information on Nutrition Coded for Machine Retrieval. Commonwealth Agricultural Bureaux, 1963.
Atenció: Aquestes cites poden no estar 100% correctes.