APA (7th ed.) Citation

Mayer, A. L. (1926). An unknown portrait of Titian's middle period.

Chicago Style (17th ed.) Citation

Mayer, August Liebmann. An Unknown Portrait of Titian's Middle Period. 1926.

MLA (9th ed.) Citation

Mayer, August Liebmann. An Unknown Portrait of Titian's Middle Period. 1926.

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