APA (7th ed.) Citation

Gori, P. (1909). Series of 3 postcards in 3 different colours.

Chicago Style (17th ed.) Citation

Gori, Pietro. Series of 3 Postcards in 3 Different Colours. 1909.

MLA (8th ed.) Citation

Gori, Pietro. Series of 3 Postcards in 3 Different Colours. 1909.

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