Totalitarianism in German national history is a big subject, and to some degree can trace back to Otto von Bismarck and his attempts to unify the Prussian states into one Germany in the 1870s. Of course we can include Kaiser Wilhelm II and his leadership of Germany through World War I. Most people would automatically think of the National Socialist Party and Hitler, and of course they qualify too.
Some sources to get you started on this can include a good biography of the Kaiser (link included below). You should also look at The Rise and Fall of the Third Reich, by William Shirer, thought to be the most definitive work on Hitler's rise and fall from power in the 1920s, 30s and 40s. I have also included a link to a biography of Otto von Bismarck.
Donald Bullock as an excellent dual biography of Hitler and Stalin entitled "Hitler and Stalin, Parallel Lives." It is more recent than the Shirer Book, and is quite scholarly. I have also attached a link to my own web page with information that may help you. My page is based on a graduate course I completed on Hitler and National Socialism. (The music you will hear on the site is sung by a group of SS men.)
In addition to the Bullock book, you might want to also examine the following sources: John Toland, Adolf Hitler, an excellent biography and more current than Shirer; and also 0R.G.L. Waite, The Psychopathic God, which offers interesting information on Hitler's personal habits as well as the source of his anti-semitism. The information at times is frightening, but informative. Finally, try to find a copy of The Nazi Germany Sourcebook,edited by Roderick Stackelberg and Sally A. Winkle, published by Routledge Press in London. It contains 148 original documents from 1850 including diplomatic records, minutes of meetings, speeches and manifestoes. It is fascinating reading and an excellent research tool.