Gaya APA
G., A, L. (1975).
Developing Skills: An Integrated Course For Intermediate Students .
Yogyakarta:
Penerbit Kanisius.
Gaya MLA
G., Alexander, L..
"Developing Skills: An Integrated Course For Intermediate Students".
Yogyakarta:
Penerbit Kanisius,
1975.
Teksbook.