Saber Perdawd Othman, & Aveen Abdulqahar Abdulmajed. (2021). Estimation of Almost Ideal Demand System on Food Expenditure in Erbil inYear 2012. QALAAI ZANIST JOURNAL, 6(3), 886–913. https://doi.org/10.25212/lfu.qzj.6.3.30