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Kotler, Philip and Armstrong, Gary and Harris, Lloyd C. and He, Hongwei (2019) Principle of Marketing (8th European edition). Pearson, Hoboken. ISBN 978-1-292-26960-3

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McDavid, James C and Huse, Irene and Ingleson, Laura R L (2019) Program Evaluation and Performance Measurement: an Introduction to Practice. Sage Publication, Thousand Oaks, California. ISBN 9781506337067

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Ray, Nilanjan (2019) Managing Diversity, Innovation, and Infrastructure in Digital Business. Advances in Human Resources Management and Organizational Development . IGI Global, Hershey, PA.. ISBN 9781522559948

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Stauss, Bernd and Seidel, Wolfgang (2019) Effective Complaint Management: The Business Case for Customer Satisfaction. Springer Nature Switzerland AG, Switzerland. ISBN 978-3-319-98705-7