- http://www.gridlover.net
- http://lamb.cc/typograph
- http://practicaltypography.com
- http://www.urtd.net/x/cod
- http://nathanfriend.io/inspirograph
- http://shields.io
- http://webfieldmanual.com/
- http://collectui.com
- http://www.danrodney.com/mac/
- https://coolors.co/
- http://pxtoem.com
- https://www.toggl.com/
- http://lists.design/
- https://github.com/thedaviddias/Front-End-Checklist
- http://threed.io/
- https://smallpdf.com
- http://htmlcolorcodes.com
- https://www.smashingmagazine.com/2016/05/an-ultimate-guide-to-css-pseudo-classes-and-pseudo-elements/
- https://google.github.io/styleguide/htmlcssguide.xml
- https://github.com/joshbuchea/HEAD
- https://html.spec.whatwg.org/multipage/forms.html#autofilling-form-controls:-the-autocomplete-attribute
- http://htmlreference.io/
- https://developer.mozilla.org/en-US/docs/Web/HTML/Element
- https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes
- https://developer.mozilla.org/en-US/docs/Web/CSS/Reference#Selectors
- https://developer.mozilla.org/en-US/docs/Web/CSS/Reference#Keyword_index
- http://www.sitepoint.com/12-little-known-css-facts
- http://www.sitepoint.com/12-little-known-css-facts-the-sequel
- http://www.leemunroe.com/responsive-email-design/
- http://learncssgrid.com/