Humanists UK has a comprehensive
list of recommended books

Some suggestions are also given below:

• ‘Enlightenment Now: The Case for Reason, Science, Humanism, and Progress’ (2018) Steven Pinker
• ‘Secularism: Politics, Religion, and Freedom’ (2017) Andrew Copson
• ‘The God Delusion: 10th Anniversary Edition’ (2016) Richard Dawkins
• ‘The God Argument: The Case Against Religion and for Humanism’ (2014) A C Grayling
• ‘Humanism: A Very Short Introduction’ (2011) Stephen Law
• ‘Atheism: A Very Short Introduction’ (2003) Julian Baggini
• Humanism An Introduction by Jim Herrick
• Modern Humanism: Living without Religion by Alfred Hobson and Neil Jenkins
• On Humanism (Thinking in Action) by Richard Norman
• Humanism, A Beginner’s Guide by Peter Cave
  
• All in the Mind: Farewell to God by Ludovic Kennedy
• God is Not Great by Christopher Hitchens
• What Is Secular Humanism? by Paul Kurtz
• Against All Gods: Six Polemics on Religion and an Essay on Kindness by A.C. Grayling
• The End of the Affair by Sam Harris
• The Good Book: A Secular Bible (Bloomsbury) by AC

Books related to major life events and coping with difficult times from a non-religious viewpoint:

Humanists UK also has a Philosophers Group which produces pamphlets and books

For “Who are Humanists?” Click here