Books? 😕
Don’t we all use Google and Stackoverflow now? 😉
(well, outsource guys do at least. Half the questions on SO are from the outsourced clearly posting the task they’ve been asked to do and are waiting for someone to post them the code. That or students doing the same for an exam).
Though more seriously, last time I touched a reference book was many years ago. I do use the above, but certain specific reference sites in particular (MDN for example for JavaScript – not the more useless w3schools that come up top in search results. MSDN for C# reference etc). SO I use for those niggly issues that should work but there’s some bug or undocumented “feature” and chances are someone on SO has an answer – not always the correct one though.