“User Experience Foundations” by Nick de Voil is the textbook for the BCS Foundation Certificate in User Experience. You can buy the book direct from the publisher – BCS, the Chartered Institute for IT:
Or from Amazon in the UK:
Or from Amazon.com:
Or loads of other places.
The book describes an approach to Human Centred Design – or, as I prefer to call it, People Oriented Design – based on international standards such as ISO 9241-210:2019 and ISO 9241-11:2018.