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When writing a letter is the name of book underlined or placed in single quotes or just let it be identified by capital letters? Which is correct in an official letter? For example would I write;

They are going to publish The Big Bug in a fortnight.

They are going to publish 'The Big Bug' in a fortnight.

They are going to publish The Big Bug in a fortnight.
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HealthystateWhen writing a letter is the name of book underlined or placed in single quotes or just let it be identified by capital letters? Which is correct in an official letter? For example would I write;

They are going to publish The Big Bug in a fortnight.

They are going to publish 'The Big Bug' in a fortnight.

They are going to publish The Big Bug in a fortnight.

In writing a letter, sentence 2 could be used. The title can also be in bold or italicised.
They are going to publish The Big Bug in a fortnight. is the least wrong, but I would use italics:

They are going to publish The Big Bug in a fortnight.
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Underlined