Narbayeva Shahnoza Robbim qizi. “BIOLOGIYANI O’QITISHDA BIOLOGIK EKSKURSIYALARNI TASHKIL ETISHNING AHAMIYATI”. World Scientific Research Journal, vol. 10, no. 2, Dec. 2022, pp. 138-42, http://wsrjournal.com/index.php/wsrj/article/view/2381.