Elements of Style

I’m starting with Rule 2 because I don’t like Rule 1.

2. In a series of three or more terms with a single conjunction, use a comma after each term except the last.

Thus write,

red, white, and blue

honest, energetic, but headstrong

He opened the letter, read it, and made a note of its contents.

This is also the usage of the Government Printing Office and of the Oxford University Press.

In the names of business firms the last comma is omitted, as

Brown, Shipley and Company

The abbreviation etc., even if only a single term comes before it, is always preceded by a comma.

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