diff --git a/src/epub/content.opf b/src/epub/content.opf
index b8e389b..28f2870 100644
--- a/src/epub/content.opf
+++ b/src/epub/content.opf
@@ -40,6 +40,7 @@
 		<meta id="long-description" property="se:long-description" refines="#description"> LONG_DESCRIPTION </meta>
 		<dc:language>en-US</dc:language>
 		<dc:source>https://www.gutenberg.org/ebooks/1595</dc:source>
+		<dc:source>https://archive.org/details/whirligigs02henrgoog</dc:source>
 		<meta property="se:production-notes">Any special notes about the production of this ebook for future editors/producers? Remove this element if not.</meta>
 		<meta property="se:word-count">WORD_COUNT</meta>
 		<meta property="se:reading-ease.flesch">READING_EASE</meta>