I have a CD with step-by-step instructions issued by National Geographic. Very good. My version is the German one, though. I would assume there should be an "original" one, i.e. one in English, out there, too, but I would not know where to get it. But my "Big National Geographic Photoguide" is really interesting, and all the example photos are, of course, first rate!
Edit: Oh, the handbook says "Based on the CD-ROM Corso di Fotografia, Edizioni La Repubblica 2002, Italy" ... hm...
But it also says "©2003 National Geographic Society"... you might find out some more if you start there?