Another source I can add is GM Walter Brownes video on the Najdorf sicilian -his repertoire choice there.
Although a bit outdated but still interesting/inspiring.

GM John Fedorowicz and GM Nick de Firmians book on the English attack has a chapter on it too.

Some of the relevant, specialised sources that spring to mind are Rizzitano's 'Play the Najdorf', Sammalvuo's 'The English Attack', De La Villa's 'Dismantling the Sicilian' and McDonald's 'Starting Out: 1.e4!'. You can probably find other relevant sources with a bit of research, but there's no substitute for being familiar with the games of Kasparov and Topalov (e.g. Shirov-Kasparov and Svidler-Topalov), plus the latest games in more topical lines.