Gaya APA
Kusuma, S, B. (1975).
Practice and progress : an intergrated course for pre-intermediate students .
Yogyakarta:
Yayasan Kanisius.
Gaya MLA
Kusuma, Sunarja, Brata.
"Practice and progress : an intergrated course for pre-intermediate students".
Yogyakarta:
Yayasan Kanisius,
1975.
BUKU.