{
  "type": "book",
  "site": {
    "name": "Kołczan Książek",
    "language": "pl-PL",
    "url": "https://www.kolczanksiazek.pl"
  },
  "formats": "Każda podstrona ma dwie wersje z tymi samymi danymi: JSON (adres strony + .json) i markdown (adres strony + .md). Do każdego `url` w tym dokumencie można dopisać .json albo .md.",
  "title": "Petra",
  "subtitle": null,
  "slug": "petra",
  "url": "https://www.kolczanksiazek.pl/maria-kruger/petra",
  "json": "https://www.kolczanksiazek.pl/maria-kruger/petra.json",
  "markdown": "https://www.kolczanksiazek.pl/maria-kruger/petra.md",
  "authors": [
    {
      "name": "Maria Krüger",
      "slug": "maria-kruger",
      "url": "https://www.kolczanksiazek.pl/maria-kruger"
    }
  ],
  "language": "pl_PL",
  "original_title": null,
  "original_language": null,
  "first_published": "1994-01-01",
  "genres": [],
  "series": [],
  "cover": "https://quivercdn.com/covers/wydawnictwo-siedmiorog/maria-kruger/petra_978-83-8279-881-4.webp?v=2026-08-14%2001%3A49%3A48",
  "description": "Petra jest pasjonującą powieścią historyczną dla dzieci napisaną przez Marię Krüger, autorkę Karolci. Maria Krüger zaprasza młodego czytelnika w podróż po średniowiecznej Polsce, a czyni to ze znaną tylko sobie wirtuozerią, wplatając autentyczne motywy i postacie w bieg fascynujących przygód...",
  "editions": [
    {
      "title": "Petra",
      "subtitle": null,
      "url": "https://www.kolczanksiazek.pl/maria-kruger/petra/9788382798814",
      "publisher": "Wydawnictwo Siedmioróg",
      "publisher_series": [],
      "translators": [],
      "medium": "paper",
      "duration_seconds": null,
      "narrators": [],
      "illustrators": [],
      "cover_artists": [],
      "isbn": "978-83-8279-881-4",
      "pages": 174,
      "published": "2025-01-01",
      "language": "pl_PL",
      "cover": "https://quivercdn.com/covers/wydawnictwo-siedmiorog/maria-kruger/petra_978-83-8279-881-4.webp?v=2026-08-14%2001%3A49%3A48"
    },
    {
      "title": "Petra",
      "subtitle": null,
      "url": "https://www.kolczanksiazek.pl/maria-kruger/petra/8371620802",
      "publisher": "ALFA",
      "publisher_series": [],
      "translators": [],
      "medium": "paper",
      "duration_seconds": null,
      "narrators": [],
      "illustrators": [],
      "cover_artists": [],
      "isbn": "8-371-62080-2",
      "pages": 155,
      "published": "1994-01-01",
      "language": "pl_PL",
      "cover": "https://quivercdn.com/covers/alfa/maria-kruger/petra_8-371-62080-2-63686c9c.jpg?v=2026-09-04%2007%3A01%3A24"
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  ],
  "other_languages": [],
  "characters": [],
  "chapters": []
}