| 1 |  | Application of digital technology in recovery and development of VietNam tourism after covid-19 pandemic / Nguyen Van Dong, Hoang Thuy Ha . - [Kđ.] : Đại học Thái Nguyên, 2022 Innovation and development of tourism after covid-19 pandemic 2022,p. 658-670, |
| 2 | | Recovery and develoment of VietNam tourism after covid-19 / Hoang Thuy Ha, Nguyen Van Dong . - [Kđ.] : Đại học Thái Nguyên, [????] Innovation and development of tourism after covid-19 pandemic [????],p. 760-770, |