Lehmann, T. (1961). Nobody knows: Negro Spirituals. Koehler & Amelang.
Cita Chicago (17th ed.)Lehmann, Theo. Nobody Knows: Negro Spirituals. Leipzig: Koehler & Amelang, 1961.
Cita MLA (8th ed.)Lehmann, Theo. Nobody Knows: Negro Spirituals. Koehler & Amelang, 1961.
Atenció: Aquestes cites poden no estar 100% correctes.