As marketers and business leaders in an ever-changing marketing landscape, we’re constantly looking for resources, knowledge and techniques to help us improve ROI and engage our consumers. Here are three authors with engaging, insightful and business-boosting books to rejuvenate your current strategies. Jeffrey Hayzlett, Clark Kokich and Sandra Zoratti challenge traditional modes of thinking and doing -- demonstrating a clear path and direction to help marketers and business change, survive and thrive. The authors walk their talk with Jeffrey Hayzlett offering 140 character chapters for easy tweeting. Kokich gave his advice through a fully-interactive app. Running the Gauntlet Jeffrey Hayzlett’s "Running the Gauntlet"…