APA (7th ed.) Citation

Ritchie, A., & Ritchie, G. (1978). The ancient Monuments of Orkney. Her Majesty's Stationery Office.

Chicago Style (17th ed.) Citation

Ritchie, Anna, and Graham Ritchie. The Ancient Monuments of Orkney. Edinburgh: Her Majesty's Stationery Office, 1978.

MLA (9th ed.) Citation

Ritchie, Anna, and Graham Ritchie. The Ancient Monuments of Orkney. Her Majesty's Stationery Office, 1978.

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