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Software Requirements, Third Edition
In my opinion, this book by Karl Wiegers and Joy Beatty is the definitive book about requirements elicitation techniques.
Full of practical suggestions and examples, this should be required reading for any Business Analyst.
A Guide to the Business Analysis Body of Knowledge (BABOK Guide), version 3
The definitive guide to Business Analysis and basis for CBAP certification from IIBA.
Agile Extension to the BABOK® Guide (Agile Extension), version 2
The source for any preparation for the AAC exam from IIBA. A must read for anyone working in Agile.
A Guide to the Project Management Body of Knowledge (PMBOK Guide), sixth edition
From PMI, the PMBOK is the comprehensive collection on project management and is the basis for the PMP certification.
Agile Practice Guide
From PMI, this is Agile from a Project Management perspective. This is the basis for the PMI-ACP certification.