Source: https://smallbusiness.yahoo.com/advisor/four-steps-fixing-biggest-customer-mistakes-220013799.html
Source: http://www.microsoft.com/business/en-us/resources/startups/business-plans-entities/7-biggest-mistakes-of-business-startups.aspx?fbid=FRztn5ANChY
Source: http://www.ceoforum.com.au/article-detail.cfm?cid=6148&t=/Neil-Waters-Egon-Zehnder-International/The-five-biggest-CEO-career-mistakes
Source: http://www.mindtools.com/pages/article/leadership-mistakes.htm