diff --git a/document/memo.txt b/document/memo.txt
index 24a57f4..e678050 100644
--- a/document/memo.txt
+++ b/document/memo.txt
@@ -3,5 +3,5 @@
 現状はブラックボックステスト[1]のみを想定しているが、構文解析等を利用して、
 ホワイトボックステスト[1]も行えればいいなぁ・・・
 
-[1]Uri Klein and Kedar S. Namjoshi, Formalization and Automated Verification of RESTful Behavior,
-   LNCS 6806, pp. 541–556, (2011), 2.3 3. Safety and idempotence.
\ No newline at end of file
+[1]Uri Klein and Kedar S. Namjoshi. (2011) "Formalization and Automated Verification of RESTful Behavior,"
+   LNCS 6806, pp. 541–556, 2.3 3. Safety and idempotence.
\ No newline at end of file