Cita APA (7a ed.)

Rails-to-Trails Conservancy, Flink, C. A., Olka, K., & Searns, R. M. (2001). Trails for the twenty-first century: Planning, design, and management manual for multi-use trails (2nd ed.). Island Press.

Cita Chicago Style (17a ed.)

Rails-to-Trails Conservancy, Charles A. Flink, Kristine Olka, y Robert M. Searns. Trails for the Twenty-first Century: Planning, Design, and Management Manual for Multi-use Trails. 2nd ed. Washington, DC: Island Press, 2001.

Cita MLA (8a ed.)

Rails-to-Trails Conservancy, et al. Trails for the Twenty-first Century: Planning, Design, and Management Manual for Multi-use Trails. 2nd ed. Island Press, 2001.