APA (7e ed.) Bronvermelding

Hopkins, L. D., & Zapata, M. (2007). Engaging the future: Forecasts, scenarios, plans, and projects. Lincoln Institute of Land Policy.

Chicago (17e ed.) Bronvermelding

Hopkins, Lewis D., en Marisa Zapata. Engaging the Future: Forecasts, Scenarios, Plans, and Projects. Cambridge, Massachusetts: Lincoln Institute of Land Policy, 2007.

MLA (9e ed.) Bronvermelding

Hopkins, Lewis D., en Marisa Zapata. Engaging the Future: Forecasts, Scenarios, Plans, and Projects. Lincoln Institute of Land Policy, 2007.