public static function get(Bookboon $bookboon, string $categoryId, array $bookTypes = ['pdf']) : BookboonResponse
    {
        $bResponse = $bookboon->rawRequest("/categories/$categoryId", ['bookType' => join(',', $bookTypes)]);

        $bResponse->setEntityStore(
            new EntityStore(
                [
                    new static($bResponse->getReturnArray())
                ]
            )
        );

        return $bResponse;
    }