"Tình hình kinh tế – xã hội quý IV và năm 2019" [Socioeconomic situation of the fourth quarter and the whole year of 2019] (PDF) (ภาษาเวียดนาม). General Statistics Office of Hanoi. 25 December 2019. เก็บ(PDF)จากแหล่งเดิมเมื่อ 10 January 2021. สืบค้นเมื่อ 24 December 2020.
"Tình hình kinh tế – xã hội quý IV và năm 2019" [Socioeconomic situation of the fourth quarter and the whole year of 2019] (PDF) (ภาษาเวียดนาม). General Statistics Office of Hanoi. 25 December 2019. เก็บ(PDF)จากแหล่งเดิมเมื่อ 10 January 2021. สืบค้นเมื่อ 24 December 2020.
"Tình hình kinh tế – xã hội quý IV và năm 2019" [Socioeconomic situation of the fourth quarter and the whole year of 2019] (PDF) (ภาษาเวียดนาม). General Statistics Office of Hanoi. 25 December 2019. เก็บ(PDF)จากแหล่งเดิมเมื่อ 10 January 2021. สืบค้นเมื่อ 24 December 2020.
"Tình hình kinh tế – xã hội quý IV và năm 2019" [Socioeconomic situation of the fourth quarter and the whole year of 2019] (PDF) (ภาษาเวียดนาม). General Statistics Office of Hanoi. 25 December 2019. เก็บ(PDF)จากแหล่งเดิมเมื่อ 10 January 2021. สืบค้นเมื่อ 24 December 2020.