There are numerous publications on Russian-Germans. A small but considerable collection can be found here.
We would like to recommend an essay by Otto Hertel (edited and published by Marie-Luise Ludewig): Otto Hertel, "Russian-Germans - A nation on long journey " Online version
Dietmar Neutatz, Träume und Alpträume - Eine Geschichte Russlands im 20. Jahrhundert, C.H.Beck, 2013, ISBN 978-3-406-64714-7
In the 20th Century Russia was recreated three times: in the context of modernization during the last year of the Czarist Empire, under the communists and after the end of the Soviet Union. The author of the book confronts the dreams of these recreations with their practical realization which more often than not turned out to be nightmares. Dietmar Neutatz vividly describes the history of Russia since the end of the 19th century with a special focus on the living environment of the people. Furthermore, he presents the answers that were found during that period to the challenges of the industrial modern age.
György Dalos, Geschichte der Russlanddeutschen - Von Katharina der Großen bis zur Gegenwart, 2., durchgesehene Auflage 2015, C.H.Beck, ISBN 978-3-406-67017-6
György Dolas follows in his literary work the destiny of a German minority in Russia. His main emphasis is on their experiences during World War I, the October Revolution, the Stalinist Dictatorship, their collectivization, deportation and forced labor before they were slowly rehabilitated and finally received the chance to return back to Germany due to Perestroika.
Viktor Krieger, Kolonisten, Sowjetdeutsche, Aussiedler - Eine Geschichte der Russlanddeutschen, Schriftenreihe der Bundeszentrale für politische Bildung, Bd. 1631. (publication series of the Federal Agency for Civic Education)
Viktor Krieger describes the history of Germans in Russia from the settler movement in the 18th century to the times when Russian-Germans sought new perspectives in the newly reunited Germany. He mainly focuses on the persecution and the discrimination of the German minority under Stalin.