Now and then :
art now at Tate Britain.
APA Citation
Tate Britain (Gallery). (2004). Now and then: art now at Tate Britain. London: Tate Britain.
MLA Citation
Tate Britain (Gallery). Now And Then: Art Now At Tate Britain. London: Tate Britain, 2004.
Warning: These citations may not always be complete (especially for serials).