Gaya APA
Riyanto. (2011).
SPEAKING ENGLISH IS EASY .
Yogyakarta:
Pustaka Widyatama.
Gaya Chicago
Riyanto.
SPEAKING ENGLISH IS EASY.
Yogyakarta:
Pustaka Widyatama,
2011.
Text.
Gaya MLA
Riyanto.
SPEAKING ENGLISH IS EASY.
Yogyakarta:
Pustaka Widyatama,
2011.
Text.
Gaya Turabian
Riyanto.
SPEAKING ENGLISH IS EASY.
Yogyakarta:
Pustaka Widyatama,
2011.
Print.