Gaya APA
Riyanto, S. (2008).
English for your better future speak english, please : ayo ngomong inggris 3 (Cet. 2).
Gorontalo:
Pustaka Pelajar.
Gaya MLA
Riyanto, Slamet.
"English for your better future speak english, please : ayo ngomong inggris 3".
Cet. 2
Gorontalo:
Pustaka Pelajar,
2008.
Text.