To what extent was the Nazis’ persecution of the Jews motivated by racism?

To what extent was the Nazis’ persecution of the Jews motivated by racism?
Hilberg, Raul: The Destruction of the European Jews. 3 vols. New York, London: Holmes & Meier, 1985. [1961]

Hilberg, Raul: Perpetrators, Victims, Bystanders: The Jewish Catastrophe 1933-1945. New York: HarperCollins, 1992.

Kershaw, Ian: Hitler, the Germans, and the Final Solution. New Haven; London: Yale UP, 2008.

Levi, Neil / Michael Rothberg (eds.): The Holocaust: Theoretical Readings. Edinburgh: Edinburgh UP, 2003.

Levi, Primo: The Drowned and the Saved. Trans. Raymond Rosenthal. London: Abacus, 1989.

Novick, Peter: The Holocaust in American Life. Boston: Houghton Mifflin, 2000 [1999].

Sicher, Efraim: The Holocaust Novel. New York; London: Routledge, 2005.

Suleiman, Susan Rubin: Crises of Memory and the Second World War. Cambridge, MA; London: Harvard UP, 2006.

Stone, Dan (ed.): The Historiography of the Holocaust. Basingstoke; New York: Palgrave Macmillan, 2004.

Waxman, Zoe Vania: Writing the Holocaust: Identity, Testimony, Representation. Oxford: OUP, 2006.

Felman, Shoshana / Dori Laub (eds.): Testimony. Crises of Witnessing in Literature,
Psychoanalysis, and History. New York; London: Routledge, 1992

Finkelstein, Norman: The Holocaust Industry: Reflections on the Exploitation of
Jewish Suffering. London, New York: Verso, 2000.

Fulbrook, Mary: German National Identity after the Holocaust. Cambridge: Polity,
1999.

Gilbert, Martin: The Holocaust: The Jewish Tragedy. London: HarperCollins, 1986.

The Roots of Evil: The Origins of Genocide and Other Group Violence
Ervin Staub
Publisher Cambridge University Press, 1992