Publication manual of the American psychological Association. Sixth edition. Washington, DC : American Psychological Association, [2010]. ©2010. xviii, 272 stran. Available on Internet: <http://external.dandelon.com/download/attachments/dandelon/ids/DE0047D90908A1295EA46C12578FF0033DA96.pdf> ISBN 978-1-4338-0562-2.