APA-viite (7. p.)

Berg, P. (1986). Nitrifier populations and nitrification rates in agricultural soil. Swedish University of Agricultural Sciences, Dept. of Microbiology.

Chicago-viite (17. p.)

Berg, Per. Nitrifier Populations and Nitrification Rates in Agricultural Soil. Uppsala: Swedish University of Agricultural Sciences, Dept. of Microbiology, 1986.

MLA-viite (8. p.)

Berg, Per. Nitrifier Populations and Nitrification Rates in Agricultural Soil. Swedish University of Agricultural Sciences, Dept. of Microbiology, 1986.