Loo, Becky P. Y.; Leung, Betty S. Y.; Wong, S. C.; Yang, Hai (1 November 2007). "Taxi License Premiums in Hong Kong: Can Their Fluctuations be Explained by Taxi as a Mode of Public Transport?". International Journal of Sustainable Transportation. 1 (4): 249–266. Bibcode:2007IJSTr...1..249L. doi:10.1080/15568310600737600. S2CID154640950.
Loo, Becky P. Y.; Leung, Betty S. Y.; Wong, S. C.; Yang, Hai (1 November 2007). "Taxi License Premiums in Hong Kong: Can Their Fluctuations be Explained by Taxi as a Mode of Public Transport?". International Journal of Sustainable Transportation. 1 (4): 249–266. Bibcode:2007IJSTr...1..249L. doi:10.1080/15568310600737600. S2CID154640950.
Loo, Becky P. Y.; Leung, Betty S. Y.; Wong, S. C.; Yang, Hai (1 November 2007). "Taxi License Premiums in Hong Kong: Can Their Fluctuations be Explained by Taxi as a Mode of Public Transport?". International Journal of Sustainable Transportation. 1 (4): 249–266. Bibcode:2007IJSTr...1..249L. doi:10.1080/15568310600737600. S2CID154640950.