(2015). Plunkett Analytics Reports. Book Stores Industry (US). Plunkett Research, Ltd..
芝加哥风格引文Plunkett Analytics Reports. Book Stores Industry (US). [S.l.]: Plunkett Research, Ltd., 2015.
MLA引文Plunkett Analytics Reports. Book Stores Industry (US). Plunkett Research, Ltd., 2015.
警告：这些引文格式不一定是100％准确.