APA (7th ed.) Citation

Fitrini, E., & Sumiratingratri, R. (2010). I Speak English. Cahaya Pustaka Raga.

Chicago Style (17th ed.) Citation

Fitrini, Erna, and Ratih Sumiratingratri. I Speak English. Cahaya Pustaka Raga, 2010.

MLA (8th ed.) Citation

Fitrini, Erna, and Ratih Sumiratingratri. I Speak English. Cahaya Pustaka Raga, 2010.

Warning: These citations may not always be 100% accurate.