APA (7th ed.) Citation

Davis, R. (1978). Royal families of the world. Collins.

Chicago Style (17th ed.) Citation

Davis, Reginald. Royal Families of the World. London: Collins, 1978.

MLA (9th ed.) Citation

Davis, Reginald. Royal Families of the World. Collins, 1978.

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