Gaya APA
Rowling, J. (2017).
Harry potter and the philosopher's stone : slytherin (20 th Anniversarry).
London:
Bloomsbury Publishing Plc.
Gaya MLA
Rowling, J.K.
"Harry potter and the philosopher's stone : slytherin".
20 th Anniversarry
London:
Bloomsbury Publishing Plc,
2017.
Text.