Valid LaTeX document styles include:
Other document styles are described under LaTeX Styles.
They are selected with the following command:
\documentstyle [options] {style}
The options for the different styles are:
1. article: 11pt, 12pt, twoside, twocolumn, draft, fleqn, leqno, acm
2. report: 11pt, 12pt, twoside, twocolumn, draft, fleqn, leqno, acm
3. letter: 11pt, 12pt, fleqn, leqno, acm
4. book: 11pt, 12pt, twoside,twocolumn, draft, fleqn, leqno
If you specify more than one option, they must be separated by a comma.