Eurostat-OECD methodological guide for developing producer price indices for services. 2nd ed. Paris : OECD, 2014. 435 s. Dostupné na : <http://www.oecd-ilibrary.org/economics/eurostat-oecd-methodological-guide-for-developing-producer-price-indices-for-services_9789264220676-en> ISBN 978-92-64-22066-9.