Sometimes an author writes about research that
someone else has done, but you are unable to track down the original
research report. In this case, because you did not read the
original report, you will include only the source you did consult in
your References. The words “as cited in” in the parenthetical
reference indicate you have not read the original research.
Adapted from Hacker/Sommers, The Bedford Handbook, 8th ed.