APA (7th ed.) Citation

Hem, J. D. (1961). Calculation and use of ion activity. United States Department of the Interior, Geological Survey.

Chicago Style (17th ed.) Citation

Hem, John David. Calculation and Use of Ion Activity. [Washington, D.C.]: United States Department of the Interior, Geological Survey, 1961.

MLA (9th ed.) Citation

Hem, John David. Calculation and Use of Ion Activity. United States Department of the Interior, Geological Survey, 1961.