APA (7th ed.) Citation

Great Britain. Royal Archives, Chopra, P. N., Chopra, P., & Padmasha. (1998). Secret papers from British Royal Archives. Konark Pub..

Chicago Style (17th ed.) Citation

Great Britain. Royal Archives, Pran Nath Chopra, Prabha Chopra, and Padmasha. Secret Papers from British Royal Archives. Delhi, India: Konark Pub., 1998.

MLA (9th ed.) Citation

Great Britain. Royal Archives, et al. Secret Papers from British Royal Archives. Konark Pub., 1998.