Connerley, Mary and Pedersen, Paul (2005) Leadership in a Diverse and Multicultural Environment: Developing Awareness, Knowledge, and Skills. SAGE Publications, Thousand Oaks, California. ISBN 978-0761988601

Fey, Victor and Rivin, Eugene I. (2005) Innovation on demand. Cambridge University Press, Cambridge, UK ; New York. ISBN 978-0521826204

Szwarc, Paul (2005) Researching Customer Satisfaction Loyalty: How to Fined Out What People Really Think. Market research in practice series . Kogan Page Limited, London. ISBN 0–7494–4336–7