You could get the same information from the other books that were mentioned. In particular, Lance Leventhal's 6502 Assembly Language Programming covers everything in the Elektor book and then some. I have the second edition of Leventhal's book here, which I purchased in March of 1987. I purchased the first edition in late 1979, which was very shortly after the book had gone to print. The second edition was the result of added coverage of the (Rockwell) 65C02 to the first edition.

The Eyes and Lichty tome was published in 1986, and is authoritative for current 65C02 and 65C816 production parts, as well as the NMOS 6502. You would do well to read it in its entirety.

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x86?  We ain't got no x86.  We don't NEED no stinking x86!

I haven't seen a student with a bad attitude or disposition make significant progress, except down a path of sheer mediocrity.

There are two tactics I've found useful in the past:
- answer the best question which might have been asked, rather than the exact question asked.
- answer for posterity not only for the present conversation - a thread will appear in searches hundreds of times after it's gone quiet.

And a third tactic, of course, is to keep a cool head and take nothing personally. Easier said than done.