Research in labor economics. Volume 33. Bingley : Emerald, 2011. online [xiv, 384 p.]. Research in labor economics. Available on Internet: <https://search.ebscohost.com/login.aspx?direct=true&db=nlebk&AN=398875&lang=sk&site=ehost-live&scope=site> ISBN 978-1-780-52333-0.