@type t() :: %Voile.ExternalBookSearch.Book{
  authors: [String.t()],
  description: String.t() | nil,
  external_id: String.t() | nil,
  isbn: String.t() | nil,
  open_library_id: String.t() | nil,
  page_count: integer() | nil,
  published_date: String.t() | nil,
  publisher: String.t() | nil,
  source: String.t(),
  thumbnail: String.t() | nil,
  title: String.t()
}