{
    "id": 406427,
    "slug": "klaas-vaak-is-boos-susan-wallenburg",
    "nstc": null,
    "title": "Klaas Vaak is boos",
    "subtitle": null,
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    "annotation": null,
    "description": "Een grappig boek over slapen en wakker blijven. Voor dagdromers vanaf 5 jaar.\n\nLekker lang opblijven! De kinderen in de stad willen allemaal niet slapen. En Klaas Vaak, het zandmannetje, vindt dat helemaal niet leuk.\nWat als hij alle dromen eens lekker voor zichzelf houdt?\n",
    "imprint": null,
    "language_code": "dut",
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    "page_count": null,
    "duration_seconds": null,
    "publication_date_first": "2021-09-20",
    "publication_date_latest": "2021-09-27",
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    "editions": [
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            "isbn": "9789044842227",
            "product_form": "BB"
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    "created_at": "2025-09-19T13:41:16+00:00",
    "updated_at": "2025-10-29T00:33:24+00:00",
    "publisher": {
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        "slug": "clavis",
        "name": "Clavis",
        "created_at": "2025-09-19T12:46:12+00:00",
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    "contributors": [
        {
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            "slug": "susan-wallenburg-2",
            "key_names": "Wallenburg",
            "names_before_key": "Susan",
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            "contributor_role": "A01",
            "readable_contributor_role": "Author"
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    "genres": [],
    "subjects": [
        {
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            "created_at": "2025-09-19T13:41:16+00:00",
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}