Gaya APA

setiawan, Y, T, I., wright, M, W, T. (1992). Classroom Observation task: A resource book for language teachers and trainers (Cet. 1). New York: Cambridge University.

Gaya MLA

setiawan, Yufiarti;, Theodorus, Immanuel., wright, Marion, Williams,, Tony. "Classroom Observation task: A resource book for language teachers and trainers". Cet. 1 New York: Cambridge University, 1992. Text.