diff --git a/citation-resolve.cabal b/citation-resolve.cabal
--- a/citation-resolve.cabal
+++ b/citation-resolve.cabal
@@ -2,7 +2,7 @@
 -- documentation, see http://haskell.org/cabal/users-guide/
 
 name:                citation-resolve
-version:             0.4.2.1
+version:             0.4.2.2
 synopsis:            convert document IDs such as DOI, ISBN, arXiv ID to bibliographic reference.
 description:         
   This modules provides a way to convert document identifiers, such
@@ -60,7 +60,6 @@
     , download-curl >= 0.1.4 
     , either >= 3.4.1
     , lens >= 3.9.0.2
-    , MissingH >= 1.1
     , mtl >= 2.1.2
 --  , hxt >= 9.3.1       -- TODO: treat xsl more properly 
 --  , hxt-xslt >= 9.1.1  -- using these libraries.
diff --git a/src/Text/CSL/Input/Identifier/Internal.hs b/src/Text/CSL/Input/Identifier/Internal.hs
--- a/src/Text/CSL/Input/Identifier/Internal.hs
+++ b/src/Text/CSL/Input/Identifier/Internal.hs
@@ -26,7 +26,6 @@
 import           Data.List (span)
 import qualified Data.Map.Strict as Map
 import qualified Data.Text as Text
-import qualified Data.String.Utils as String (replace)
 import qualified Data.Yaml as Yaml
 import           Network.Curl.Download (openURIWithOpts)
 import           Network.Curl.Opts (CurlOption(CurlFollowLocation, CurlHttpHeaders))
@@ -160,7 +159,7 @@
   bs <- liftIOE $ openURIWithOpts opts url
   return $
     unlines . drop 2 . filter (any (not . isSpace)) . lines $
-    String.replace "adsurl" "url" $
+    stringReplace "adsurl" "url" $
     BS.unpack bs
 
 resolveBibcode :: MonadIO m => RM m String String
@@ -171,7 +170,7 @@
   bs <- liftIOE $ openURIWithOpts opts url
   return $
     unlines . drop 2 . filter (any (not . isSpace)) . lines $
-    String.replace "adsurl" "url" $ BS.unpack bs
+    stringReplace "adsurl" "url" $ BS.unpack bs
 
 resolveISBN :: MonadIO m => RM m String String
 resolveISBN docIDStr = do
@@ -202,3 +201,10 @@
   dd <- Paths.getDataDir
   createDirectoryIfMissing True dd
   Paths.getDataFileName fn
+
+-- | String version of replace.
+
+stringReplace :: String -> String -> String -> String
+stringReplace a b c = 
+  Text.unpack $
+  Text.replace (Text.pack a) (Text.pack b) (Text.pack c)