diff --git a/LD2/RDF/base.md b/LD2/RDF/base.md
index 4e15e260..5e0c32e5 100644
--- a/LD2/RDF/base.md
+++ b/LD2/RDF/base.md
@@ -27,3 +27,4 @@
 
 ### link
 - https://cybernetics.fandom.com/ru/wiki/Turtle
+- https://w3c.github.io/rdf-turtle/spec/ ; https://www.w3.org/TR/rdf12-n-triples/#simple-triples ; https://book.validatingrdf.com/bookHtml008.html