APA (7th ed.) Citation

Parry, C., & Hopkins, C. (1970). An index of British treaties: 1101 - 1968. Her Maj. Stat. Office.

Chicago Style (17th ed.) Citation

Parry, Clive, and Charity Hopkins. An Index of British Treaties: 1101 - 1968. London: Her Maj. Stat. Office, 1970.

MLA (9th ed.) Citation

Parry, Clive, and Charity Hopkins. An Index of British Treaties: 1101 - 1968. Her Maj. Stat. Office, 1970.