Gaya APA
Tumijo, ., Riyanto, S.
(2009).
successful Strategies for toefl
.
Yogyakarta:
Pustaka Widyatama.
Gaya MLA
Tumijo, ., Riyanto, Slamet.
"successful Strategies for toefl".
Yogyakarta:
Pustaka Widyatama,
2009.
Referensi Koleksi Buku Soal.