Campbell, Kayleigh B. and Candace Brakewood
"Sharing riders: How bikesharing impacts bus ridership in New York City."
Transportation Research Part A: Policy and Practice 100 (2017): 264-282. 

Campbell, Kayleigh B, James RisingJacqueline M Klopp, and Jacinta Mwikali Mbilo.
"Accessibility across transport modes and residential developments in Nairobi."
Journal of Transport Geography 74 (2018): 77-90. 

Working Papers 

"Historical transit, density, and carbon dioxide emissions in U.S. cities"