APA (7th ed.) Citation

Robinson, W. A. (1984). 'The sacrifice of Isaac', an unpublished painting by Nicolaes Maes.

Chicago Style (17th ed.) Citation

Robinson, William A. 'The Sacrifice of Isaac', an Unpublished Painting by Nicolaes Maes. 1984.

MLA (9th ed.) Citation

Robinson, William A. 'The Sacrifice of Isaac', an Unpublished Painting by Nicolaes Maes. 1984.

Warning: These citations may not always be 100% accurate.