Van Burgh, D., Lyons, E. N., & Boyington, M. (1998). How to teach with topographic maps. National Science Teachers Association.
Cita Chicago (17th ed.)Van Burgh, Dana, Elizabeth N. Lyons, i Marcy Boyington. How to Teach with Topographic Maps. Arlington, Va: National Science Teachers Association, 1998.
Cita MLA (9th ed.)Van Burgh, Dana, et al. How to Teach with Topographic Maps. National Science Teachers Association, 1998.
Atenció: Aquestes cites poden no estar 100% correctes.