References
^ Stephan Schiffman25 Toughest Sales Objections-And How to Overcome Them by Stephan Schiffman (2011, Paperback) ISBN 9780071767378 (revised Feb 2023)^ Schiffman, Stephan (2015). 25 Toughest Sales Objections-and How to Overcome Them, McGraw-Hill. BiggerBooks. ISBN 9780071767378 (revised Aug 2023)^ (2013). 25 Toughest Sales Objections-and How to Overcome Them ECampus. ISBN 9780071767378 (revised Feb 2023)
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