Technically, if you didnt take the photos, or porcude teh artwork, or purchase the piece, you would be in violation of copyright law. Many personal “free to view” webpages get away with displaying a lot of different things, mainly because it would be impossible to police all the personal sites, file injunctions, notify ISP’s with proper credentials, etc Putting them into a book, will get you noticed, and give the copyright holders something to shoot for in a lawsuit. I doubt any professional publisher would accept the works without a release for each photo.