Barney, Jay B. and Clark, Delwyn N. (2007) Resource-based theory: creating and sustaining competitive advantage. Oxford University Press, Oxford; New York. ISBN 978–0–19–927768–1

Bryon, Mike (2007) How to Pass the GMAT: Unbeatable Preparation for Success in the Graduate Management Admission Test (Elite Students Series) 1st Edition. Kogan Page, London. ISBN 978–0–7494–4459–4

Meisel, Robert M. and Babby, Steven J. and Marsh, Steven F. (2007) The executive guide to understanding and implementing Lean Six Sigma: the financial impact. The ASQ Quality Management Division economics of quality book series . ASQ Quality Press, Milwaukee. ISBN 9780873897112