Motti, Pietro Schlüssel zur kleinen russischen Sprachlehre / Pietro Motti. - Heidelberg : J. Groos, 1904. - 55 p. ; 20 cm. - Methode Gaspey-Otto-Sauer . - Methode Gaspey-Otto-Sauer . Շարվածքը՝ 8 x 13 սմ. Subjects--Topical Terms: Russian language--Composition and exercises.