diff --git a/src/csl/taxonomy.rs b/src/csl/taxonomy.rs
index 29a1c98..ebaa8b3 100644
--- a/src/csl/taxonomy.rs
+++ b/src/csl/taxonomy.rs
@@ -679,21 +679,48 @@ impl EntryLike for Entry {
     }
 }
 
+#[cfg(feature = "csl-json")]
+fn resolve_csl_json_standard_variable(
+    item: &citationberg::json::Item,
+    variable: StandardVariable,
+) -> Option<Cow<'_, ChunkedString>> {
+    match item.0.get(&variable.to_string())? {
+        csl_json::Value::String(s) => {
+            Some(Cow::Owned(StringChunk::normal(s.clone()).into()))
+        }
+        csl_json::Value::Number(n) => {
+            Some(Cow::Owned(StringChunk::normal(n.to_string()).into()))
+        }
+        _ => None,
+    }
+}
+
 #[cfg(feature = "csl-json")]
 impl EntryLike for citationberg::json::Item {
     fn resolve_standard_variable(
         &self,
-        _: LongShortForm,
+        form: LongShortForm,
         variable: StandardVariable,
     ) -> Option<Cow<'_, ChunkedString>> {
-        match self.0.get(&variable.to_string())? {
-            csl_json::Value::String(s) => {
-                Some(Cow::Owned(StringChunk::normal(s.clone()).into()))
-            }
-            csl_json::Value::Number(n) => {
-                Some(Cow::Owned(StringChunk::normal(n.to_string()).into()))
-            }
-            _ => None,
+        match variable {
+            StandardVariable::Title => match form {
+                LongShortForm::Short => {
+                    // Per citeproc tests, a 'title-short' without 'title' is
+                    // valid and should be used when the short form is
+                    // selected.
+                    resolve_csl_json_standard_variable(self, StandardVariable::TitleShort)
+                        .or_else(|| {
+                            resolve_csl_json_standard_variable(
+                                self,
+                                StandardVariable::Title,
+                            )
+                        })
+                }
+                LongShortForm::Long => {
+                    resolve_csl_json_standard_variable(self, StandardVariable::Title)
+                }
+            },
+            _ => resolve_csl_json_standard_variable(self, variable),
         }
     }
 
diff --git a/src/types/strings.rs b/src/types/strings.rs
index e33d140..c374fe9 100644
--- a/src/types/strings.rs
+++ b/src/types/strings.rs
@@ -251,12 +251,6 @@ impl Serialize for ChunkedString {
     }
 }
 
-impl From<ChunkedString> for String {
-    fn from(value: ChunkedString) -> Self {
-        value.to_string()
-    }
-}
-
 impl ChunkedString {
     /// Creates a new empty `ChunkedString`.
     pub fn new() -> Self {
diff --git a/tests/citeproc-pass.txt b/tests/citeproc-pass.txt
index f132d31..0aad4bf 100644
--- a/tests/citeproc-pass.txt
+++ b/tests/citeproc-pass.txt
@@ -128,8 +128,11 @@ disambiguate_YearSuffixMacroSameYearExplicit
 disambiguate_YearSuffixMacroSameYearImplicit
 disambiguate_YearSuffixWithEtAlSubsequent
 flipflop_OrphanQuote
+form_TitleShort
+form_TitleShortNoLong
 form_TitleTestNoLongFalse
 fullstyles_APA
+group_ShortOutputOnly
 group_SuppressValueWithEmptySubgroup
 integration_CitationSort
 integration_CitationSortTwice