Reference management software
The greater the number of your research results, books and documents, the more could it be helpful to collect and organize your literature at one central point.
So-called reference management programmes assist you in this work. Additionally, they help you to create your text - e.g. by generating automatically your footnotes and bibliography.
The Trier University of Applied Sciences has licensed the reference management software Citavi 5 Pro (preliminary until November 2016). Citavi offers an English user interface.