Gaya APA
Widyantoro, A., S, M, R. (2005).
Developing Competence in English For Junior High School year IX .
Surakarta:
Mediatama.
Gaya MLA
Widyantoro, Agus., S, Mahmudah, Ratna.
"Developing Competence in English For Junior High School year IX".
Surakarta:
Mediatama,
2005.
Text.