- The Native Slugs of Northern Virginia: A Profile of Slugging in the Washington D.C. Region – Master’s Project by Marc Oliphant at Virginia Tech
- 511 Rideshare Casual Carpool Survey Summary 2010 – Survey of San Francisco Bay Area casual carpool commuters
- Slugging to Work: Anonymous Ridesharing – NPR Morning Edition piece from May 2008 on the ad-hoc ridesharing phenomenon in Washington, DC.
- Slug-Lines.com – An introduction and brief history to the concept of slugging.
- Casual Carpool 1998 Update: RIDES for Bay Area Commuters, Inc. – A very interesting survey about the commuting habits of casual carpoolers in San Francisco. Very interesting information on mode choice alternatives and why they choose to carpool.