Gaya APA

BALLIN, W.H. (1999). PERFECT YOUR ENGLISH . : .

Gaya Chicago

BALLIN, W.H. PERFECT YOUR ENGLISH. : , 1999. Text.

Gaya MLA

BALLIN, W.H. PERFECT YOUR ENGLISH. : , 1999. Text.

Gaya Turabian

BALLIN, W.H. PERFECT YOUR ENGLISH. : , 1999. Print.