Twenty-five American masterpieces :
[Exhibition] April 23 through May 11, 1968, the Gallery of American Art at Hirschl & Adler Galleries.

APA Citation

Hirschl & Adler Galleries. (1968). Twenty-five American masterpieces: [Exhibition] April 23 through May 11, 1968, the Gallery of American Art at Hirschl & Adler Galleries. New York.

MLA Citation

Hirschl & Adler Galleries. Twenty-five American Masterpieces: [Exhibition] April 23 Through May 11, 1968, the Gallery of American Art At Hirschl & Adler Galleries. New York, 1968.

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