References
^ (2013). Making Waves : How to Ride the Chaos with Direct Response Integrated Marketing ECampus. ISBN 9780857082121 (revised Aug 2024)^ Davies, Mark; Catling, Tina (2015). Making Waves : How to Ride the Chaos with Direct Response Integrated Marketing, Capstone. BiggerBooks. ISBN 9780857082121 (revised Jan 2024)
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