Nguồn tài liệu
https://www.jw.org/vi/thu-vien/tap-chi/tinh-thuc-so1-2020-thang3-thang4/nguyen-nhan-gay-cang-thang/
https://www.jw.org/vi/thu-vien/tap-chi/tinh-thuc-so1-2020-thang3-thang4/cang-thang-la-gi/
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