APA (7th ed.) Citation

Gray, T. R. G., & Williams, S. T. (1971). Soil Micro-Organisms. Addison-Wesley Longman Ltd..

Chicago Style (17th ed.) Citation

Gray, T. R. G., and S. T. Williams. Soil Micro-Organisms. New York: Addison-Wesley Longman Ltd., 1971.

MLA (9th ed.) Citation

Gray, T. R. G., and S. T. Williams. Soil Micro-Organisms. Addison-Wesley Longman Ltd., 1971.