The $A tag is used only on the title page to indicate the name of the author or authors.
How it works
$A is added before the author’s name.
// Title page
$T His Last Bow
$ST A Reminiscence of Sherlock Holmes
$A Arthur Conan Doyle
$P John Murray Publishers, London, England
$PB
$T His Last Bow
$ST A Reminiscence of Sherlock Holmes
$A Arthur Conan Doyle
$P John Murray Publishers, London, England
$PB
Multiple authors
There can be more than one author so the $A tag can be used more than once, or can contain multiple author names.
$A George Smith and David Jones
$A George Smith
$A David Jones
$A David Jones
It can also be used to indicate others involved in the preparation of the book, such as editors.
$A Editor: Andrew Macdonald
$A Series editor: Patrick Murphy
$A Series editor: Patrick Murphy