Book excerpt: This book is designed to provide students with knowledge to be able to explore various research topics in the field of linguistics and language education. This book is suitable for students in the language department considering that it contains discussion on theoretical, interdisciplinary, and applied linguistic research. Discussion on research in the fields of phonology and morphology represent theoretical linguistic research. Meanwhile, discussion on sociolinguistic and pragmatic research issues represent interdisciplinary linguistic studies. In addition, applied linguistic research issues are represented by the research in the field of language education. This book is expected to encourage students to be able to dig out more Language research topics as they have been provided with some knowledge on theories of various language disciplines.