APA aipamena

Drs.Slamet Riyanto. (2012). Speaking English is Easy. Yogyakarta: Pustaka Widyatama.

Chicago Style aipamena

Drs.Slamet Riyanto. Speaking English Is Easy. Yogyakarta: Pustaka Widyatama, 2012.

MLA aipamena

Drs.Slamet Riyanto. Speaking English Is Easy. Yogyakarta: Pustaka Widyatama, 2012.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.