<hi xmlns="http://www.tei-c.org/ns/1.0" rend="bold" xml:space="preserve">Rubin, Kenneth S. </hi>(2012): <hi xmlns="http://www.tei-c.org/ns/1.0" rend="italic">Essential Scrum: A Practical Guide to the Most Popular Agile Process</hi>. Addison-Wesley Professional.