public function getPage($pageNumber)
    {
        if (!\is_numeric($pageNumber)) {
            throw new \InvalidArgumentException(
                'Page number needs to be a number.'
            );
        }

        if ($pageNumber < 1 || $pageNumber > $this->getPageCount()) {
            throw new \InvalidArgumentException(
                \sprintf(
                    'Page number "%s" out of available page range (1 - %s)',
                    $pageNumber,
                    $this->getPageCount()
                )
            );
        }

        $this->readPages();

        $page = $this->pages[$pageNumber - 1];

        if ($page instanceof PdfIndirectObjectReference) {
            $readPages = function ($kids) use (&$readPages) {
                $kids = PdfArray::ensure($kids);

                /** @noinspection LoopWhichDoesNotLoopInspection */
                foreach ($kids->value as $reference) {
                    $reference = PdfIndirectObjectReference::ensure($reference);
                    $object = $this->parser->getIndirectObject($reference->value);
                    $type = PdfDictionary::get($object->value, 'Type');

                    if ($type->value === 'Pages') {
                        return $readPages(PdfDictionary::get($object->value, 'Kids'));
                    }

                    return $object;
                }

                throw new PdfReaderException(
                    'Kids array cannot be empty.',
                    PdfReaderException::KIDS_EMPTY
                );
            };

            $page = $this->parser->getIndirectObject($page->value);
            $dict = PdfType::resolve($page, $this->parser);
            $type = PdfDictionary::get($dict, 'Type');
            if ($type->value === 'Pages') {
                $kids = PdfType::resolve(PdfDictionary::get($dict, 'Kids'), $this->parser);
                $page = $this->pages[$pageNumber - 1] = $readPages($kids);
            } else {
                $this->pages[$pageNumber - 1] = $page;
            }
        }

        return new Page($page, $this->parser);
    }