Brehm, Barbara, et.al. Computing Teacher . Notice that there is a small mistake in each part. Look at each part of the citation individually. They're the easiest part of the citation to get wrong, so it's best to set them aside.
Names are also easy to mix up.
It's possible that Robert Kenneth is really Kenny Roberts. Also, the citation may have more than one author. Select a database from the list below. Many databases allow you to search by phrase or to truncate word stems to find all endings. If at first you don't succeed, don't get discouraged.