Index: doc/bibliography/pl.bib
===================================================================
--- doc/bibliography/pl.bib	(revision 67467a31bf2574b870213fc394db73de3327ce27)
+++ doc/bibliography/pl.bib	(revision 544b799408fb08cc575919c0f8f0349222400c8d)
@@ -1146,4 +1146,5 @@
     address	= {Geneva, Switzerland},
     year	= 1999,
+    month	= dec,
     note	= {\url{https://webstore.ansi.org/Standards/INCITS/INCITSISOIEC98991999R2005}},
 }
@@ -1157,6 +1158,32 @@
     organization= {International Standard Organization},
     address	= {Geneva, Switzerland},
-    year	= 2012,
+    year	= 2011,
+    month	= dec,
     note	= {\url{https://www.iso.org/standard/57853.html}},
+}
+
+@manual{C18,
+    keywords	= {IISO/IEC C 18},
+    contributer	= {pabuhr@plg},
+    key		= {C18},
+    title	= {C Programming Language ISO/IEC 9899:2018},
+    edition	= {4th},
+    organization= {International Standard Organization},
+    address	= {Geneva, Switzerland},
+    year	= 2018,
+    month	= jun,
+    note	= {\url{https://www.iso.org/standard/74528.html}},
+}
+
+@manual{C23,
+    keywords	= {IISO/IEC C 23},
+    contributer	= {pabuhr@plg},
+    key		= {C23},
+    title	= {C Programming Language ISO/IEC DIS 9899:2023},
+    edition	= {1st},
+    organization= {International Standard Organization},
+    address	= {Geneva, Switzerland},
+    year	= 2023,
+    note	= {\url{https://www.iso.org/obp/ui/en/\#iso:std:iso-iec:9899:dis:ed-5:v1:en}},
 }
 
@@ -1457,7 +1484,8 @@
 @misc{Clang,
     keywords	= {clang},
+    key		= {clang},
     contributer	= {a3moss@uwaterloo.ca},
     title	= {Clang: a {C} language family frontend for {LLVM}},
-    howpublished= {\url{https://clang.llvm.org/}}
+    howpublished= {\url{https://clang.llvm.org}}
 }