1. The De-scription of technical objects;Akrich,1992
2. Map of Shenzhen metro;Baidu Map,2022
3. Governing uneven mobilities: Walking and hierarchized circulation in Hong Kong;Barber;Journal of Transport Geography,2020
4. Process-Tracing Methods: Foundations and Guidelines;Beach,2019
5. Process Tracing: From Metaphor to Analytic Tool,2015