O`quv qo`llanma Boltabayev M. P aut Qosimova M. S aut G`oyibnazarov B. K aut Ergashxodjayeva Sh. J aut Samadov A. N aut Otajonov Sh. I aut uz Toshkent Noshir 2011 uzb 280 b. 52806-52815 500 nusxa 9789943353589 111220 20260805124746.0 00000000000042915