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.