Suvaryan, S.R. “VISION OF SERVICE AND NECESSITY OF SERVICEOLOGY”. Proceedings of the YSU C: Geological and Geographical Sciences 49, no. 3 (238) (December 14, 2015): 42–50. Accessed November 21, 2024. https://pub.ysu.am/index.php/proceedings-geol-geogr/article/view/vol49_no3_2015_pp042-050.