The modifiable sources of the original book (in italian), the images and example files are available in sxi format (OpenOffice Impress) on spaghettibrain. Openoffice is an office suite completely free, downloadable from www.openoffice.org.
See Section 1.2 for the modifiable sources of this document. These are the official versions. We (the translators and current maintainers) plan to continue work on this document and add new chapters and enhancements. If you want to see the version we are currently working on (the "bleeding edge" version), check http://www.karakas-online.de/EN-Book/ from time to time.