APA استشهاد

Berg,,Gerald, & Berg , G.. (1978). Indicators of viruses in water and food. Ann arbor science.

استشهاد بنمط شيكاغو

Berg,,Gerald, و Gerald Berg. Indicators of Viruses in Water and Food. Michigan: Ann arbor science, 1978.

MLA استشهاد

Berg,,Gerald, و Gerald Berg. Indicators of Viruses in Water and Food. Ann arbor science, 1978.