Nguồn tài liệu

https://www.jw.org/vi/thu-vien/tap-chi/thap-canh-2-2021-thang5-thang6/the-gioi-moi-dia-dang/

https://www.jw.org/vi/thu-vien/tap-chi/thap-canh-2-2021-thang5-thang6/tan-the-sap-den-cau-hoi/

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