APA
Lang Winfried, Nellhold Hanspeter, . (1995). Environmental protection and International law. London: Graham & Trotman.
Chicago
Lang Winfried, Nellhold Hanspeter, . 1995. Environmental protection and International law. London: Graham & Trotman.
Harvard
Lang Winfried, Nellhold Hanspeter, . (1995). Environmental protection and International law. London: Graham & Trotman.
MLA
Lang Winfried, Nellhold Hanspeter, . Environmental protection and International law. London: Graham & Trotman. 1995.