When there is no author, use the title of the work in the place of the author. Shorten it to the first two or three words if it is long.
Cite the source at the end of the sentence only (see next citation example).
Lower levels of four gut bacteria are associated with increased risk for asthma in infants ("Four Gut Bacteria," 2015).
Four gut bacteria decrease asthma risk in infants [Media release]. (2015, September 30). http://news.ubc.ca/2015/09/30/four-gut-bacteria-decrease-asthma-risk-in-infants/