APA (7th ed.) Citation

Becker, W. M. (2003). Flags of the Papal States: 1800 - 1870. Flag Research Center.

Chicago Style (17th ed.) Citation

Becker, William M. Flags of the Papal States: 1800 - 1870. Winchester, Mass: Flag Research Center, 2003.

MLA (9th ed.) Citation

Becker, William M. Flags of the Papal States: 1800 - 1870. Flag Research Center, 2003.

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