{
  "type": "edition",
  "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": "The Fertility Formula",
  "subtitle": null,
  "url": "https://www.kolczanksiazek.pl/natalie-crawford/en/the-fertility-formula/9780593994306",
  "publisher": "Penguin Life",
  "publisher_series": [],
  "translators": [],
  "medium": "paper",
  "duration_seconds": null,
  "narrators": [],
  "illustrators": [],
  "cover_artists": [],
  "isbn": "978-05-9399-430-6",
  "pages": 416,
  "published": "2026-04-14",
  "language": "en_US",
  "cover": "https://quivercdn.com/covers/penguin-life/natalie-crawford/the-fertility-formula_978-05-9399-430-6-ab8c461a.jpg?v=2026-09-19%2007%3A07%3A15",
  "json": "https://www.kolczanksiazek.pl/natalie-crawford/en/the-fertility-formula/9780593994306.json",
  "markdown": "https://www.kolczanksiazek.pl/natalie-crawford/en/the-fertility-formula/9780593994306.md",
  "binding": "Hardcover",
  "description": "NATIONAL BESTSELLER An indispensable guide to fertility, covering everything you need to know to optimize your hormones, get pregnant, and take charge of your reproductive health. Most of us are taught...",
  "book": {
    "title": "The Fertility Formula",
    "slug": "the-fertility-formula",
    "url": "https://www.kolczanksiazek.pl/natalie-crawford/en/the-fertility-formula"
  },
  "authors": [
    {
      "name": "Natalie Crawford",
      "slug": "natalie-crawford",
      "url": "https://www.kolczanksiazek.pl/natalie-crawford"
    }
  ]
}