na INLIS000000000000369 20210225023711 0010-0221000328 Why ? Canada / Sangseok YOON Sangseok YOON I 184 Jakarta : PT. Elex Media Komputindo, 2017 807 807 SAN w 978-602-02-9990-7 20.01.00032.2 20.01.00032.1