Pavlov, I. P. Twenty Years of Objective Study of the Higher Nervous Activity (Behavior) of Animals. Conditioned Reflexes (Dvadtsatiletniy opyt...), 1951. In Russian.
Penner D.I., Ugarov V.A. Electrodynamics and the Special Theory of Relativity (Elektrodinamika i spetsial'naya teoriya otnositel'nosti), 1980. In Russian
Persian Historical Documents in the Book Depositories of Georgia (Sp'arsuli istoriuli sabutebi Sakartvelos ts'igntsatsavebshi). Book I, 1961. In Georgian and Persian.
Petritsi, Ioane. Examination of the Platonic Philosophy and of Proclus Diadochus (Rassmotrenie platonovskoi filosofii i Prokla Diadokha). 1942. First edition in Russian.
Petrovsky, I. G. Lectures on the Theory of Ordinary Differential Equations (Lektsii po teorii obyknovennykh differentsial'nykh uravneniy). First edition, 1939. In Russian.
Pevzner, L. M. Fundamentals of Technology of Food Preparation for the Patient in Light of Modern Views in Diet Therapy (Osnovy tekhnologii prigotovleniya pishchi dlya bolnogo v svete sovremennykh vozzreniy v dietoterapii), 1946. In Russian