public static function getCoversFolder() {

		$path = \Pressbooks\Utility\get_media_prefix() . 'covers/';
		if ( ! file_exists( $path ) ) {
			mkdir( $path, 0775, true );
		}

		$path_to_htaccess = $path . '.htaccess';
		if ( ! file_exists( $path_to_htaccess ) ) {
			// Restrict access
			\Pressbooks\Utility\put_contents( $path_to_htaccess, "deny from all\n" );
		}

		return $path;
	}