Twenty modern masterpieces :
acquired during the first twenty years of the Gallery.

APA Citation

Scottish National Gallery of Modern Art. (1980). Twenty modern masterpieces: acquired during the first twenty years of the Gallery. Edinburgh: National Galleries of Scotland.

MLA Citation

Scottish National Gallery of Modern Art. Twenty Modern Masterpieces: Acquired During the First Twenty Years of the Gallery. Edinburgh: National Galleries of Scotland, 1980.

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