Gaya APA
Riyanto, S. (2012).
Seribu Satu Items To Boost Your Toefl Exam With Key Answers (Cet.1).
Yogyakarta:
Pustaka pelajar.
Gaya MLA
Riyanto, Slamet.
"Seribu Satu Items To Boost Your Toefl Exam With Key Answers".
Cet.1
Yogyakarta:
Pustaka pelajar,
2012.
Text.