NIM:3213063021 Razzaq, Abdul. 2010. A Study on Cohesive Devices Used in Social Science Textbooks. Thesis, submitted to the English Study Program of STAIN Tulungagung. Advisor: Sukarsono, M.Pd. Keywords: cohesive devices, social science textbooks. English as an international language which is there are many science books and technology written in English. So we essentially learn English, …