Books by Holger
Currently, Holger has written one English book and seven German books. Some of his books have been translated to Spanish, Chinese, Finnish, Czech and Russian. In 2016 he will also release some English DVDs and online video courses (currently only available in German).
Click here to see his bestseller "Effective Time Management: Using Microsoft Outlook to Organize Your Work and Personal Life" on amazon.com, look inside the book and order the print version or the kindle version.