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  1. By: Betrem, J. G. (Johan George),
    Type: Article
    In: Tijdschrift voor entomologie
    Volume: 88
    Date: 1947
    Page Range: 409--416
    Publication Info: [Amsterdam], Nederlandse Entomologische Vereniging,
  2. By: Betrem, J. G. (Johan George),
    Type: Article
    In: Tijdschrift voor entomologie
    Volume: 78
    Date: 1935
    Page Range: 1--78
    Publication Info: [Amsterdam], Nederlandse Entomologische Vereniging,
  3. By: Betrem, J. G. (Johan George),
    Type: Article
    In: Tijdschrift voor entomologie
    Volume: Suppl. 75
    Date: 1932
    Page Range: 89--96
    Publication Info: [Amsterdam], Nederlandse Entomologische Vereniging,
  4. By: Betrem, J. G. (Johan George),
    Type: Article
    In: Entomologische berichten
    Volume: 15
    Date: 1954
    Page Range: 106--112
    Publication Info: Amsterdam
  5. By: Betrem, J. G. (Johan George),
    Type: Article
    In: Entomological news
    Volume: 74
    Date: 1963
    Page Range: 70--72
    Publication Info: [Philadelphia], American Entomological Society, 1925-
  6. By: Betrem, J. G. (Johan George),
    Type: Article
    In: Entomological news
    Volume: 73
    Date: 1962
    Page Range: 205--207
    Publication Info: [Philadelphia], American Entomological Society, 1925-
  7. By: Betrem, J. G. (Johan George),
    Type: Article
    In: Entomological news
    Volume: 73
    Date: 1962
    Page Range: 146--146
    Publication Info: [Philadelphia], American Entomological Society, 1925-
  8. By: Bradley, J. Chester (James Chester), - Betrem, J. G. (Johan George),
    Type: Article
    In: Bulletin of the British Museum (Natural History) Entomology
    Volume: 20
    Date: 1967
    Page Range: 287--327
    Publication Info: London, The Museum, 1950-1977
  9. By: Betrem, J. G. (Johan George),
    Type: Article
    In: Tijdschrift voor entomologie
    Volume: 103
    Date: 1960
    Page Range: 51--81
    Publication Info: [Amsterdam], Nederlandse Entomologische Vereniging,