(2015). Plunkett Analytics Reports. Book Stores Industry (US). Plunkett Research, Ltd..
Chicago-čujuhus (17. p.)Plunkett Analytics Reports. Book Stores Industry (US). [S.l.]: Plunkett Research, Ltd., 2015.
MLA-čujuhus (9. p.)Plunkett Analytics Reports. Book Stores Industry (US). Plunkett Research, Ltd., 2015.
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