wrote Drupal 7 Multi Sites Configuration
comprising 104 pages back in 2012.
Textbook and eTextbook are published under ISBN 1849518009 and 9781849518000.
Since then Drupal 7 Multi Sites Configuration textbook
was available to sell back to BooksRun online for the top buyback price
or rent at the marketplace.
A tutorial on how to run multiple Drupal 7 web sites from a single installation. A complete review is available at http://books.slashdot.org/story/12/07/15/1515213/book-review-drupal-7-multi-sites-configuration