Better way of ensuring even number of pages

bboc.tex

@@ -12,6 +12,7 @@
 \usepackage{graphicx}
 \usepackage[absolute,overlay]{textpos}
 \usepackage{longtable}
+\usepackage[strict]{changepage}
 \usepackage{epigraph}
 \setlength{\epigraphwidth}{0.8\textwidth}
 \newcommand{\repigraph}[2]{\epigraph{\flushright\enquote{#1}}{#2}}
@@ -96,11 +97,16 @@ This is the inside of the cover. We could put stuff here.
 \input{33_Capitalism_and_barbary_Black_table_of_slaughters_and_wars_in_the_XXth_century}
 \input{appendix}
 
-% this maneuver works so long as the bibliography is only one page
-\clearpage{\cleardoublepage}
 \bibliography{refs}
 \bibliographystyle{ieeetr}
 
+\checkoddpage
+\ifoddpage
+\else
+\newpage
+% extra page inserted to make the back cover an even page
+~
+\fi
 \newpage{\thispagestyle{empty}}
 This is the inside of the back.
 \newpage{\thispagestyle{empty}}