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Iogannes Hermanus Mishel 'Yan' Kok (1835 yil 11 mart - 1899-yil 31-oktyabr) - bur generali va siyosatchisi De Kock, W. J.. Dictionary of South African biography: Vol II. Pretoria: Human Sciences Research Council, 1972 — 370-bet. ISBN 0-624-00856-8. OCLC 20937. </ref>.