Khamdun, K., Suparmi, S., Maridi, M. and Rusilowati, A. 2021. Development of vocational science learning devices to improve project based soft skills. Linguistics and Culture Review. 5, S1 (Jul. 2021), 201-213. DOI:https://doi.org/10.21744/lingcure.v5nS1.1348.