Heyck, Hartmut (2003). "Labour Services in the Weimar Republic and their Ideological Godparents". Journal of Contemporary History. 38 (2). SAGE Publications: 221–236. doi:10.1177/0022009403038002131. ISSN0022-0094. S2CID159763812.
semanticscholar.org
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Heyck, Hartmut (2003). "Labour Services in the Weimar Republic and their Ideological Godparents". Journal of Contemporary History. 38 (2). SAGE Publications: 221–236. doi:10.1177/0022009403038002131. ISSN0022-0094. S2CID159763812.
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Heyck, Hartmut (2003). "Labour Services in the Weimar Republic and their Ideological Godparents". Journal of Contemporary History. 38 (2). SAGE Publications: 221–236. doi:10.1177/0022009403038002131. ISSN0022-0094. S2CID159763812.