(2020). 环 球．2020,no.9-12.
Chicago Style aipamena环 球．2020,no.9-12. 2020.
MLA aipamena环 球．2020,no.9-12. 2020.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.
APA aipamena
(2020). 环 球．2020,no.9-12.
Chicago Style aipamena环 球．2020,no.9-12. 2020.
MLA aipamena环 球．2020,no.9-12. 2020.