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The complex field types, reference, lookup and tree stores the item the reference as text: 

  {0D45476E-F67C-4F14-9B4E-C26D53F6EC48}

It's possible to resolve the value by using implicit casting to the Lookup object 

// Reference, lookup, tree
public static string outReferenceLookup(Sitecore.Data.Items.Item item, string sFieldName)
{
  System.Text.StringBuilder builder = new System.Text.StringBuilder();
  Sitecore.Data.Fields.LookupField lookupField = item.Fields[sFieldName];
  if (lookupField.TargetItem!=null)
  {
    builder.Append("lookupField.TargetItem.DisplayName : " + lookupField.TargetItem.DisplayName);
    builder.Append("<br />");
    builder.Append("lookupField.TargetItem.Paths.GetFriendlyUrl() : " + lookupField.TargetItem.Paths.GetFriendlyUrl());
    builder.Append("<br />");
  }
  else
    builder.Append(sFieldName + " does not link to a valid item");
  return builder.ToString();
}

Result:

lookupField.TargetItem.DisplayName : updater
lookupField.TargetItem.Paths.GetFriendlyUrl() : /updater.html

Possible values:

Reference: Blank (null) or GUID

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