The use of lower case can alternatively be dictated by the pronunciation of the acronym. Acronyms pronounced as words, e.g. ''[[Defra]]'', are written with an initial capital, whereas where they are spelt out, e.g. ''[[ISBN]]'', capitals are retained throughout. This is the style used in [[the Guardian]]<ref>http://www.guardian.co.uk/styleguide</ref>.
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The use of lower case can alternatively be dictated by the pronunciation of the acronym. Acronyms pronounced as words, e.g. ''[[Defra]]'', are written with an initial capital, whereas where they are spelt out, e.g. ''[[ISBN]]'', capitals are retained throughout. This is the style used in [[the Guardian]][http://www.guardian.co.uk/styleguide].