APA (7th ed.) Citation

Gray, T. R. G., & Williams, S. T. (1971). Soil micro-organisms. Oliver and Boyd.

Chicago Style (17th ed.) Citation

Gray, T. R. G., and S. T. Williams. Soil Micro-organisms. Edinburgh: Oliver and Boyd, 1971.

MLA (9th ed.) Citation

Gray, T. R. G., and S. T. Williams. Soil Micro-organisms. Oliver and Boyd, 1971.