APA引文

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

Chicago Style Citation

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

MLA引文

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

警告：這些引文格式不一定是100％准確.