Encyclopaedia Britannica. - Chicago [et al.] : Encyclopaedia Britannica : William Benton, [c.1964]. - 29 cm.см.. - (A new survey of universal knowledge). - 1768 წლიდან[MFN: 44925]
Vol. 17 : P to Plant Quarantine. - [c.1964]. - 1027 p. : ill., tab. + [37] inset l., ill.[MFN: 44942]
UDC: 030=111
E 28.933/4 - General StockE 24.942/4 = 030=111/E-54 - Reference and Bibliographic Division