Six centuries of headdress :
exhibition, April 3-May 1, 1955 : bal aux chapeaux, April 16, Dallas Museum of Fine Arts.

APA Citation

Dallas Museum of Art. (1955). Six centuries of headdress: exhibition, April 3-May 1, 1955 : bal aux chapeaux, April 16, Dallas Museum of Fine Arts. Dallas: The Museum.

MLA Citation

Dallas Museum of Art. Six Centuries of Headdress: Exhibition, April 3-May 1, 1955 : Bal Aux Chapeaux, April 16, Dallas Museum of Fine Arts. Dallas: The Museum, 1955.

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