If one has a serious interest in Steinitz, it might be of interest to get Paul Morphy and the Evolution of Chess Theory.
https://www.chess.com/clubs/forum/view/books-on-morphy
If I remember correctly, it includes a reprint of an extended discussion of Morphy by Steinitz.
https://web.archive.org/web/20140627075509/http://www.chesscafe.com/text/hansen42.pdf