Planning and Designing a Site: Resources
Williams, Robin. The Non-designer's Design Book : Design and Typographic Principles for the Visual Novice. Fourth ed. 2015.- Harvard Library: The non-designer's design book by Robin Williams
Krug, Steve. Don't Make Me Think, Revisited : A Common Sense Approach to Web Usability. Third ed. 2014.
And some others
Garrett, Jesse James. The Elements of User Experience : User-centered Design for the Web and beyond. 2nd ed. Voices That Matter. Berkeley, CA: New Riders, 2011.
Lynch, Patrick J, and Horton, Sarah. Web Style Guide: Basic Design Principles for Creating Web Sites. 3rd ed. New Haven: Yale University Press, 2009.
Rosenfeld, Louis, Morville, Peter, and Arango, Jorge. Information Architecture: For the Web and beyond. Fourth ed. 2015.