APA (7th ed.) Citation

Encyclopedia Britannica Educational Corporation, inance, C. L., helton, J. S., Weiss, L. E., & roner, S. (1967). How solid is rock?

Chicago Style (17th ed.) Citation

Encyclopedia Britannica Educational Corporation, Charles L. inance, John S. helton, Lionel E. Weiss, and Stanley roner. How Solid Is Rock? Encyclopedia Britannica Educational Corporation in collaboration with Lionel E. Weiss, 1967.

MLA (9th ed.) Citation

Encyclopedia Britannica Educational Corporation, et al. How Solid Is Rock? 1967.