Amazon

https://www.amazon.com/amazon-books/b?ie=UTF8&node=13270229011

Largest online bookstore.

Book Browse

https://www.bookbrowse.com/

"Your guide to exceptional books"

BookBub

https://www.bookbub.com/welcome 

Book seller.

BookRags

http://www.bookrags.com/#gsc.tab=0

Study guides and more.

Common Sense Media

https://www.commonsensemedia.org/book-reviews

Reviews and more.

Good Reads

https://www.goodreads.com/

Reviews and more. Amazon owned.

Independent - UK

https://www.independent.co.uk/arts-entertainment/books

Reviews and more.

Kirkus

https://www.kirkusreviews.com/

Reviews and more.

LitLovers

https://www.litlovers.com/

"A well read online community"

Los Angeles Review of Books

https://lareviewofbooks.org/

Reviews.

NY Times

https://www.nytimes.com/section/books

Reviews and articles.

NPR Books

https://www.npr.org/books

Reviews and more.

NY Journal of Books

https://www.nyjournalofbooks.com/

Reviews.

Plugged In

https://www.pluggedin.com/books/

Reviews.

Publishers Weekly

https://www.publishersweekly.com/pw/reviews/index.html

Reviews and more.

The Atlantic

https://www.theatlantic.com/books/

Reviews and more.

The Guardian

https://www.theguardian.com/books

Reviews and more.

The New Yorker

https://www.newyorker.com/culture

Reviews and more.

The Paris Review

https://www.theparisreview.org/

Reviews and more.

The Washington Post

https://www.washingtonpost.com/entertainment/books/

Reviews and more.

USA Today

https://www.usatoday.com/entertainment/books/

Reviews and more.