Person-Centred Counselling in Action (Counselling in Action series) The core textbook for many person-centred courses and in essence, you don't need much else other than this to hone your practice.
Practicing Client-Centered Therapy: Selected Writings of Barbara Temaner Brodley A lesser known book but covers all the most important topics and questions in person-centred counselling from a true pioneer
Working at Relational Depth in Counselling and Psychotherapy A hugely important book in the development of aspects of the person-centred approach. Controversial at times, but a must read for more advanced ways of working
On Becoming a Person A seminal book in Rogers extensive contributions. My personal favourite for linking theory to self and understanding person-centred theory
Learning and Being in Person-Centred Counselling Wonderfully clear and simple book that covers all the main areas and has some very useful exercises/questions to consider
The Person-Centred Counselling Primer: A Steps in Counselling Supplement (Counselling Primers) A wonderful introduction in a short format. Not too daunting like some others!