Babayan, J. All about tenses / J. Babayan, V. Avagyan; "Interlingua" Linguistic University. - Yerevan : Zangak-97, 2006. - 286 p. : tabl. ; 20 cm. - 42-8 (NLA) . ISBN: 9994111264 Subjects--Topical Terms: English language--Grammar Universal Decimal Class. No.: 42-8 (NLA)