Mergner, G. (1973). Debatte um Engels. Rowohlt.
Cita Chicago (17th ed.)Mergner, Gottfried. Debatte Um Engels. Reinbek bei Hamburg: Rowohlt, 1973.
Cita MLA (8th ed.)Mergner, Gottfried. Debatte Um Engels. Rowohlt, 1973.
Atenció: Aquestes cites poden no estar 100% correctes.