diff --git a/application/module/Reference/Ris.php b/application/module/Reference/Ris.php
index 7e30ef73..5b6ff16d 100644
--- a/application/module/Reference/Ris.php
+++ b/application/module/Reference/Ris.php
@@ -277,7 +277,13 @@ class Ris
 	
 	//创建reference 字段
 	public function makeReferenceFlag($ref){
-		$str = join(', ',$ref['author']).'. ';
+		$str='';
+		if(is_array($author) && count($author) > 0)
+		{
+			$str .= join(', ',$ref['author']).'. ';
+		} else if if(is_string($author)) {
+			$str .= $ref['author'].'. ';
+		}
 		$str .= $ref['title'].'. ';
 		$str .= $ref['publisher'].', ';
 		isset($ref['year']) ? 	$str .= $ref['year'].', ':"";