Orwell in Spain :
the full text of Homage to Catalonia with associated articles, reviews and letters from The complete works of George Orwell /
[George Orwell] ; edited by Peter Davison ; introduction by Christopher Hitchens.

APA Citation

Orwell, G., Davison, P. (2001). Orwell in Spain: the full text of Homage to Catalonia with associated articles, reviews and letters from The complete works of George Orwell. London: Penguin Books.

MLA Citation

Orwell, George, 1903-1950, and Peter Davison. Orwell In Spain: the Full Text of Homage to Catalonia With Associated Articles, Reviews And Letters From The Complete Works of George Orwell. London: Penguin Books, 2001.

Warning: These citations may not always be complete (especially for serials).