Updated.

bibliography.bib

@@ -162,3 +162,12 @@
     address = {Boston, Massachusetts},
     annote = {Primary source.}
 }
+
+@book{LongBall41,
+    author = {Longfellow, Henry Wadsworth},
+    title = {Ballads and Other Poems},
+    year = {1841},
+    publisher = {John Owen},
+    address = {Cambridge, Massachusetts},
+    annote = {Primary source; evidence of interest in New England Vikings previous to Horsford.},
+}