Recommended book for students to buy:

Study Guide for OCR psychology AS Level, Fiona Lintern, Hodder & Stoughton

Book that had all key studies in needed for exam and background information:
Psychology and Everyday Life, Karon Oliver, Hodder & Stoughton

Book with key studies in and evaluation issues: Psychology AS for OCR, Fiona Lintern, Lynne Williams and Alan Hill, Heinemann

Used for practical investigations:
Research Methods for OCR Psychology, Beth Black and Cara Flanagan, Nelson Thornes

Used as a back up for the key studies- everything summarised: A Level Psychology Through Diagrams, Grahame Hill, Oxford Revision Guides, Oxford Press

General reference for studies:
Key Studies in Psychology, 5 th Edition, Richard Gross, Hodder & Stoughton