diff --git a/REB/REB.csl b/REB/REB.csl
index 481170d..cce85c8 100644
--- a/REB/REB.csl
+++ b/REB/REB.csl
@@ -594,6 +594,9 @@ interview  ;  Interview
             <if locator="folio">
               <text variable="locator"/>
             </if>
+            <else-if locator="book">
+              <text variable="locator" text-case="uppercase"/>
+            </else-if>
             <else>
 	      <text variable="locator" font-variant="small-caps"/>
             </else>