Zuelzer, W. W. (1982). The Nicolai case: A biography / Zuelzer, Wolf W. Wayne State Univ. Press.
Lua i Stíl Chicago (17ú heag.)Zuelzer, Wolf W. The Nicolai Case: A Biography / Zuelzer, Wolf W. Detroit: Wayne State Univ. Press, 1982.
Lua MLA (8ú heag.)Zuelzer, Wolf W. The Nicolai Case: A Biography / Zuelzer, Wolf W. Wayne State Univ. Press, 1982.
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