Zhakupova Gulmira Nurtaevna, и Sagandyk Assem Talgatovna. «DEVELOPMENT OF TECHNOLOGY OF YOGHURT BY USING ACID WHEY». Academic Scientific Journal of Chemistry, вып. 4, сентябрь 2020 г., сс. 51-57, http://89.250.84.46/chemistry-technology/article/view/452.