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  1. By: Swellengrebel, N. H. (Nicolaas Hendrik), - Swellengrebel de Graaf, J. M. H.
    Type: Article
    In: Tijdschrift voor entomologie
    Volume: 63
    Date: 1920
    Page Range: 96--108
    Publication Info: [Amsterdam], Nederlandse Entomologische Vereniging,
  2. By: Swellengrebel, N. H. (Nicolaas Hendrik), - Swellengrebel de Graaf, J. M. H.
    Type: Article
    In: Bulletin of entomological research
    Volume: 11
    Date: 1920
    Page Range: 77--92
    Publication Info: Farnham Royal, Commonwealth Agricultural Bureaux,