Mendum, T. A., Sockett, R. E., & Hirsch, P. R. (1999). Use of Molecular and Isotopic Techniques To Monitor the Response of Autotrophic Ammonia-Oxidizing Populations of the β Subdivision of the Class Proteobacteria in Arable Soils to Nitrogen Fertilizer. American Society for Microbiology.

Mendum, T. A., R. E. Sockett, و P. R. Hirsch. Use of Molecular and Isotopic Techniques To Monitor the Response of Autotrophic Ammonia-Oxidizing Populations of the β Subdivision of the Class Proteobacteria in Arable Soils to Nitrogen Fertilizer. American Society for Microbiology, 1999.

Mendum, T. A., R. E. Sockett, و P. R. Hirsch. Use of Molecular and Isotopic Techniques To Monitor the Response of Autotrophic Ammonia-Oxidizing Populations of the β Subdivision of the Class Proteobacteria in Arable Soils to Nitrogen Fertilizer. American Society for Microbiology, 1999.