(2015). Plunkett Analytics Reports. Book Stores Industry (US). Plunkett Research, Ltd..
Cita Chicago (17th ed.)Plunkett Analytics Reports. Book Stores Industry (US). [S.l.]: Plunkett Research, Ltd., 2015.
Cita MLA (9th ed.)Plunkett Analytics Reports. Book Stores Industry (US). Plunkett Research, Ltd., 2015.
Atenció: Aquestes cites poden no estar 100% correctes.