APA
UNHCR,, . (1993). The state of the world's refugees : The challenge of protection. Harmondsworth: Penguin Books.
Chicago
UNHCR,, . 1993. The state of the world's refugees : The challenge of protection. Harmondsworth: Penguin Books.
Harvard
UNHCR,, . (1993). The state of the world's refugees : The challenge of protection. Harmondsworth: Penguin Books.
MLA
UNHCR,, . The state of the world's refugees : The challenge of protection. Harmondsworth: Penguin Books. 1993.