APA (7. basım) Alıntı

Orr, D. W. (2011). Hope is an imperative: The essential David Orr. Island Press.

Chicago Style (17. basım) Atıf

Orr, David W. Hope Is an Imperative: The Essential David Orr. Washington, DC: Island Press, 2011.

MLA (9th ed.) Atıf

Orr, David W. Hope Is an Imperative: The Essential David Orr. Island Press, 2011.