Gaya APA

Alter, J. (1980). Corrective English : For Certificate Student ( Leanguage Work And Usage ) With Answer (edisi 1). Hongkong: Times Educational.

Gaya MLA

Alter, J.B.. "Corrective English : For Certificate Student ( Leanguage Work And Usage ) With Answer". edisi 1 Hongkong: Times Educational, 1980. Text.