public function saveCopyReference($path, $copyReference)
    {
        //Path and Copy Reference cannot be null
        if (is_null($path) || is_null($copyReference)) {
            throw new Exceptions\BoxClientException("Path and Copy Reference cannot be null.");
        }

        //Save Copy Reference
        $response = $this->postToAPI('/files/copy_reference/save', ['path' => $path, 'copy_reference' => $copyReference]);
        $body = $response->getDecodedBody();

        //Response doesn't have Metadata
        if (!isset($body['metadata']) || !is_array($body['metadata'])) {
            throw new Exceptions\BoxClientException("Invalid Response.");
        }

        //Make and return the Model
        return ModelFactory::make($body['metadata']);
    }