I would recommend Alex Maccaw's javascript Web Applications. Sure it's about Javascript, but how really big can your HTML/CSS get before you modularize? :) What

I would recommend Alex Maccaw's javascript Web Applications. Sure it's about Javascript, but how really big can your HTML/CSS get before you modularize? :) What I like about the book is that it explains the fundamentals of MVC in a framework agnostic way, which I think is helpful if you are trying to refactor and MVC-ize your code base without throwing in a heavy dependency like Backbone or Spine.