diff --git a/book/references.md b/book/references.md
index 963aafd..b971cbd 100644
--- a/book/references.md
+++ b/book/references.md
@@ -4,7 +4,7 @@ The following documents provide more background and supportive information.
 
 | **Reference**  | **Document Title** | 
 | -------- | --------- | 
-| `CEOS-OS-BP` <a name="CEOS-OS-BP"></a> | [CEOS OpenSearch Best Practice Document, Version 1.3](https://ceos.org/document_management/Working_Groups/WGISS/Documents/WGISS%20Best%20Practices/EOS%20OpenSearch%20Best%20Practice.pdf) | 
+| `CEOS-OS-BP` <a name="CEOS-OS-BP"></a> | [CEOS OpenSearch Best Practice Document, Version 1.3](https://ceos.org/document_management/Working_Groups/WGISS/Documents/WGISS%20Best%20Practices/CEOS%20OpenSearch%20Best%20Practice.pdf) | 
 | `OGC 10-157r4` <a name="OGC10-157r4"></a> | [Earth Observation Metadata profile of Observations & Measurements, Version 1.1](https://docs.ogc.org/is/10-157r4/10-157r4.html) | 
 | `OGC 10-032r8` <a name="OGC10-032r8"></a> | [OpenSearch Geo and Time Extensions](https://portal.ogc.org/files/?artifact_id=56866) | 
 | `OGC 13-026r9` <a name="OGC13-026r9"></a> | [OpenSearch Extension for Earth Observation](http://docs.opengeospatial.org/is/13-026r9/13-026r9.html) |