diff --git a/agora pkg chapter.md b/agora pkg chapter.md
index 350d906d4..983d077e2 100644
--- a/agora pkg chapter.md	
+++ b/agora pkg chapter.md	
@@ -79,7 +79,7 @@ This project is of very large scope and might make use of non standard terminolo
 - [[Stoa]]: a repository of resources maintained by a group over time.
 - [[Bridge]]: a device or process connecting contexts, applying to both nodes and repositories.
 - [[Siphon]]: a bridge which exploits a gradient.
-- [[Commons]]: as per [[Elinor Ostrom]].
+- [[Commons]]: as per [[Elinor Ostrom]], [[Silke Helfrich]], [[David Bollier]].
 
 # Principles