Sulastri Sipapaga, and Sri Rezeki Pane. 2023. “The Effect of Age And Work Period On Teaching Quality Of Economics Teachers At SMK N 1 Nainggolan Samosir T.P 2015 2016”. Outline Journal of Education 2 (2): 53-57. https://doi.org/10.61730/oje.v2i2.169.