Gaya APA
Tumijo, ., riyanto, S.
(2010).
99,99% Sukses TOEFL
.
Yogyakarta:
pustaka widyatama.
Gaya MLA
Tumijo, ., riyanto, Slamet.
"99,99% Sukses TOEFL".
Yogyakarta:
pustaka widyatama,
2010.
Text.