Vangroenweghe, Daniël[in Dutch] (2020) [1985]. Rood Rubber [Red Rubber] (in Dutch). De Geus. p. 70.
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Slade 1962, p. 171. Slade, Ruth M. (1962). King Leopold's Congo: Aspects of the Development of Race Relations in the Congo Independent State. Institute of Race Relations. Oxford: Oxford University Press. OCLC655811695.
Slade 1962, p. 172. Slade, Ruth M. (1962). King Leopold's Congo: Aspects of the Development of Race Relations in the Congo Independent State. Institute of Race Relations. Oxford: Oxford University Press. OCLC655811695.
Slade 1962, p. 173. Slade, Ruth M. (1962). King Leopold's Congo: Aspects of the Development of Race Relations in the Congo Independent State. Institute of Race Relations. Oxford: Oxford University Press. OCLC655811695.
Slade 1962, p. 178. Slade, Ruth M. (1962). King Leopold's Congo: Aspects of the Development of Race Relations in the Congo Independent State. Institute of Race Relations. Oxford: Oxford University Press. OCLC655811695.
Slade 1962, p. 177. Slade, Ruth M. (1962). King Leopold's Congo: Aspects of the Development of Race Relations in the Congo Independent State. Institute of Race Relations. Oxford: Oxford University Press. OCLC655811695.
Slade 1962, p. 181. Slade, Ruth M. (1962). King Leopold's Congo: Aspects of the Development of Race Relations in the Congo Independent State. Institute of Race Relations. Oxford: Oxford University Press. OCLC655811695.
Slade 1962, p. 115. Slade, Ruth M. (1962). King Leopold's Congo: Aspects of the Development of Race Relations in the Congo Independent State. Institute of Race Relations. Oxford: Oxford University Press. OCLC655811695.
Slade 1962, p. 179. Slade, Ruth M. (1962). King Leopold's Congo: Aspects of the Development of Race Relations in the Congo Independent State. Institute of Race Relations. Oxford: Oxford University Press. OCLC655811695.
Slade 1962, pp. 178–179. Slade, Ruth M. (1962). King Leopold's Congo: Aspects of the Development of Race Relations in the Congo Independent State. Institute of Race Relations. Oxford: Oxford University Press. OCLC655811695.
Slade 1962, p. 180. Slade, Ruth M. (1962). King Leopold's Congo: Aspects of the Development of Race Relations in the Congo Independent State. Institute of Race Relations. Oxford: Oxford University Press. OCLC655811695.