APA (7th ed.) Citation

Davis, H. C., & Davis, P. R. (1975). A Post-Habsburg index. [H. Hayes].

Chicago Style (17th ed.) Citation

Davis, H. C., and P. R. Davis. A Post-Habsburg Index. [Batley, West Yorkshire]: [H. Hayes], 1975.

MLA (9th ed.) Citation

Davis, H. C., and P. R. Davis. A Post-Habsburg Index. [H. Hayes], 1975.