Gray, T. R., & Williams, S. T. (1975). Soil micro-organisms. Longman.
Chicago Style (17th ed.) CitationGray, T. R., and S. T. Williams. Soil Micro-organisms. Edinburgh: Longman, 1975.
MLA (9th ed.) CitationGray, T. R., and S. T. Williams. Soil Micro-organisms. Longman, 1975.