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diff --git a/ref.bib b/ref.bib
index 18fda32..fe410b6 100644
--- a/ref.bib
+++ b/ref.bib
@@ -275,6 +275,30 @@
   file     = {:Adobe2012 - Extensible Metadata Platform (XMP) Specification.pdf:PDF},
 }
 
+@Article{Ford2004,
+  author       = {Bryan Ford},
+  date         = {2004-01},
+  journaltitle = {ACM SIGPLAN Notices},
+  title        = {Parsing expression grammars},
+  doi          = {10.1145/982962.964011},
+  issn         = {1558-1160},
+  number       = {1},
+  pages        = {111--122},
+  subtitle     = {a recognition-based syntactic foundation},
+  volume       = {39},
+  publisher    = {Association for Computing Machinery (ACM)},
+}
+
+@Online{MacFarlane2014,
+  author       = {John {MacFarlane}},
+  date         = {2014-10-25},
+  title        = {If anyone wants to contribute a BNF, please do! But I'm very skeptical that it can be done, due to},
+  url          = {https://github.com/commonmark/commonmark-spec/issues/113#issuecomment-60467783},
+  organization = {GitHub, Inc.},
+  titleaddon   = {[Comment on code issue "Add BNF specification"]},
+  urldate      = {2025-05-17},
+}
+
 @Comment{jabref-meta: databaseType:biblatex;}
 
 @Comment{jabref-meta: fileDirectory-jonas-bastian:/home/jonas/Projects/RUC/LIB/md;}