Nhã Ca 1969. Giải khăn sô cho Huế. https://www.vinadia.org/giai-khan-so-cho-hue-nha-ca/ [Last accessed on March 26, 2021]
https://www.smithsonianmag.com/history/revisiting-vietnam-50-years-after-tet-offensive-180967501/ [Last accessed on March 26, 2021]