diff --git a/app/controllers/personal_books_controller.rb b/app/controllers/personal_books_controller.rb
index 74db8ea..48d3c80 100644
--- a/app/controllers/personal_books_controller.rb
+++ b/app/controllers/personal_books_controller.rb
@@ -63,7 +63,7 @@ class PersonalBooksController < ApplicationController
            t << {"value" => "<a href='#{OrbitHelper.url_to_show(book.to_param)}'>#{book.create_link}</a>"}
           end
         when "publish_date", "publication_date"
-          t << {"value" => book.publication_date.strftime("%Y/%m/%d")}
+          t << {"value" => "book.publication_date.strftime('%Y/%m/%d')"}
         when "author_type"
           t << {"value" => (book.book_author_types.collect{|bat| bat.title}.join(", ") rescue "")}
         when "language"