Do we have any other things for you to read? Does a bear bare all in the woods? Just look at what we have in store for winter reading:
Lertap's help file is called Lelp. It's available in a variety of formats, of which the most-readily accessible is an HTML version found at: http://www.lertap.curtin.edu.au/HTMLHelp/HTML/index.html.
An electronic copy of Lertap's manual is freely available on-line from Assessment Systems Corporation, ASC. The good people at ASC are happy to sell you a bound copy of the manual if you'd like an already-printed copy (would make a wonderful present for a loved one).
One of the most important chapters from the manual, Chapter 2, may be admired on its own. Just get on-line, and browse to http://www.lertap.curtin.edu.au/Documentation/Chapter2.htm.
There's a modest but exceptionally erudite collection of semi-technical papers, as well as other material, at the main documentation centre: http://www.lertap.curtin.edu.au/Documentation.htm.