Gray, T. (1971). Soil micro-organisms. Oliver and Boyd.
Cita Chicago Style (17a ed.)Gray, T.R.G. Soil Micro-organisms. Edinburgh: Oliver and Boyd, 1971.
Cita MLA (8a ed.)Gray, T.R.G. Soil Micro-organisms. Oliver and Boyd, 1971.
Precaución: Estas citas no son 100% exactas.