Pensions at a glance 2015 : OECD and G20 indicators. Paris : OECD, 2015. 374 s. OECD pensions at a glance. Dostupné na : <http://www.oecd-ilibrary.org/social-issues-migration-health/pensions-at-a-glance-2015_pension_glance-2015-en> ISBN 978-92-64-24063-6.