Cita APA (7th ed.)

Orr, D. W. (2011). Hope is an Imperative: The Essential David Orr. Island Press/Center for Resource Economics. https://doi.org/10.5822/978-1-61091-017-0

Cita Chicago (17th ed.)

Orr, David W. Hope Is an Imperative: The Essential David Orr. Washington, DC: Island Press/Center for Resource Economics, 2011. https://doi.org/10.5822/978-1-61091-017-0.

Cita MLA (9th ed.)

Orr, David W. Hope Is an Imperative: The Essential David Orr. Island Press/Center for Resource Economics, 2011. https://doi.org/10.5822/978-1-61091-017-0.