Gaya APA
Riyanto, S. (2008).
The 1 Students Choice TOEFL : Test Strategy For Structure and Written Expression .
Yogyakarta:
Pustaka Pelajar.
Gaya MLA
Riyanto, Slamet.
"The 1 Students Choice TOEFL : Test Strategy For Structure and Written Expression".
Yogyakarta:
Pustaka Pelajar,
2008.
Buku Tex.