APA (7th ed.) Citation

Webster, R. S., & Webster, M. K. (1971). An index of western scientific instrument makers to 1850 (Spiralbindung.). Selbstverlag.

Chicago Style (17th ed.) Citation

Webster, R. S., and M. K. Webster. An Index of Western Scientific Instrument Makers to 1850. Spiralbindung. Winnetka, Ill: Selbstverlag, 1971.

MLA (9th ed.) Citation

Webster, R. S., and M. K. Webster. An Index of Western Scientific Instrument Makers to 1850. Spiralbindung. Selbstverlag, 1971.