shirlaw, G. D. W. (1962). Soil fertility and field methods of analysis: A guide for agricultural students and advisers, gardeners and horticulturalists. Cassell & co. Ltd.
Citação norma Chicagoshirlaw, Gilchrist D W. Soil Fertility and Field Methods of Analysis: A Guide for Agricultural Students and Advisers, Gardeners and Horticulturalists. London: Cassell & co. Ltd, 1962.
Citação norma MLAshirlaw, Gilchrist D W. Soil Fertility and Field Methods of Analysis: A Guide for Agricultural Students and Advisers, Gardeners and Horticulturalists. Cassell & co. Ltd, 1962.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.