In the following we recommond you several books which are good to use for the REQB CPRE Foundation Level exam. These books should in that case always be used in combination with the syllabus in its newest version. The syllabus is freely availble here

Hull, Elizabeth, Jackson, Ken, Dick, Jeremy: Requirements Engineering. Springer 2005.
ISBN: 978-1-85233-879-4

Wiegers, Karl: Software Requirements, Second Edition. Microsoft 2003.
ISBN: 0-7356-1879-8

Robertson, SUzanne, Robertson, James: Mastering the Requirements Process. Addison-Wesley 2008.
ISBN: 0-321-41949-9


van Lamsweerde, Axel: Requirements Engineering. Wiley 2009.
ISBN: 978-0-470-01270-3

Sommerville, Ian, Sawyer, Pete: Requirements Engineering - A good practice guide. Wiley 2004.
ISBN: 0-471-97444-7

Sommerville, Ian: Software Engineering 8. Addison-Wesley 2007.
ISBN: 0-321-31379-8

Gilb, Tom: Competitive Engineering. Elsevier 2007.
ISBN: 0-7506-6507-6