--- a/Paper/reference.bib	Tue Nov 06 14:39:20 2018 +0900
+++ b/Paper/reference.bib	Tue Nov 06 16:54:52 2018 +0900
@@ -6,9 +6,37 @@
 
 %% Saved with string encoding Unicode (UTF-8) 
 
-
+@misc{1pugs,
+    title = {Pugs: A Perl 6 Implementation},
+    howpublished = {\url{http://hackage.haskell.org/package/Pugs}},
+}
 
-@misc{perl6doc,
+@misc{2perl6doc,
     title = {Perl6 Documentation},
     howpublished = {\url{https://docs.perl6.org/}},
 }
+
+@misc{perl6design,
+    title = {Perl 6 Design Documents},
+    howpublished = {\url{https://design.perl6.org/}},
+}
+
+@misc{rost,
+    title = {Roast -- Perl6 test suite},
+    howpublished = {\url{https://github.com/perl6/roast}},
+}
+
+@misc{parrot,
+    title = {Parrot},
+    howpublished = {\url{http://parrot.org/}},
+}
+
+@misc{nqpopcode,
+    title = {NQP Opcode List},
+    howpublished = {\url{https://github.com/perl6/nqp/blob/master/docs/ops.markdown}},
+}
+
+@misc{nqp,
+    title = {NQP - Not Quite Perl (6)},
+    howpublished = {\url{https://github.com/perl6/nqp}},
+}