PISA 2015 Results : Student's Well-Being. Volume III. Paris : OECD, 2017. 525 s. PISA. Available on Internet: <https://www.oecd-ilibrary.org/education/pisa-2015-results-volume-iii_9789264273856-en> ISBN 978-92-64-27381-8. [Copy count : 1, currently available 1, at library only 0]