APA (7th ed.) Citation

Gripsholm (Museum : Sweden), National Portrait Gallery (Smithsonian Institution), & Johnsson, U. G. (1988). Masterpieces from Gripsholm Castle: The Swedish National Portrait Collection. National Swedish Art Museums.

Chicago Style (17th ed.) Citation

Gripsholm (Museum : Sweden), National Portrait Gallery (Smithsonian Institution), and Ulf G. Johnsson. Masterpieces from Gripsholm Castle: The Swedish National Portrait Collection. Stockholm: National Swedish Art Museums, 1988.

MLA (9th ed.) Citation

Gripsholm (Museum : Sweden), et al. Masterpieces from Gripsholm Castle: The Swedish National Portrait Collection. National Swedish Art Museums, 1988.