PISA 2015 Results : Collaborative Problem Solving. Volume V. Paris : OECD, 2017. 305 s. PISA. Available on Internet: <https://www.oecd-ilibrary.org/education/pisa-2015-results-volume-v_9789264285521-en> ISBN 978-92-64-28550-7. [Copy count : 1, currently available 1, at library only 0]