Website: Check out Peter Van Buskirk's fantastic website Best College Fit: www.bestcollegefit.com/ He offers outstanding advice on the entire college application process, and his regular blog posts are informative and useful.
Book: Steven Antonoff, College Match: A Blueprint for Choosing the Best School For You, 13th edition (2017): amzn.to/2kTUnnL
Book: Donald Asher, Cool Colleges for the Hyper-Intelligent, Self-Directed, Late Blooming, and Just Plain Different (2007): amzn.to/2sxzzqy
Book: Jacques Steinberg, The Gatekeepers: Inside the Admission Process of A Premier College (2003): amzn.to/2Jvu0CM
Book: Robin Mamlet and Christine Vandevelde, College Admission: From Application to Acceptance, Step by Step (2011): https://amzn.to/2KoxWTK