Su, Fengming, Jan-Dirk Schmöcker, and Michael G.H. Bell. “Mode Choice of Older People Before and After Shopping: A Study With London Data”. Journal of Transport and Land Use 2, no. 1 (March 27, 2009). Accessed May 3, 2024. https://www.jtlu.org/index.php/jtlu/article/view/69.