The linked site's text comes from this source material: https://mitp-content-server.mit.edu/books/content/sectbyfn/books_pres_0/6515/sicp.zip/index.html https:/

The linked site's text comes from this source material: https://mitp-content-server.mit.edu/books/content/sectbyfn/books_pres_0/6515/sicp.zip/index.html https://mitp-content-server.mit.edu/books/content/sectbyfn/b... So you can continue to explore the rest of the book for free (without the aid of the built-in interactive interpreter). Check out Racket and its included support for the particular Scheme used by SICP: https://docs.racket-lang.org/sicp-manual/ https://docs.racket-lang.org/sicp-manual/