APA
Okowa Phoebe,, . (2000). State responsibility for transboundary air pollution in international law. Oxford: Oxford University Press.
Chicago
Okowa Phoebe,, . 2000. State responsibility for transboundary air pollution in international law. Oxford: Oxford University Press.
Harvard
Okowa Phoebe,, . (2000). State responsibility for transboundary air pollution in international law. Oxford: Oxford University Press.
MLA
Okowa Phoebe,, . State responsibility for transboundary air pollution in international law. Oxford: Oxford University Press. 2000.