Gaya APA

Focus on grammar [CD-ROM] : the interactive multimedia program for learners of en : basic level, Samuela Eckstut. (1996). : New York, Addison Wesley Longman.

Gaya MLA

Focus on grammar [CD-ROM] : the interactive multimedia program for learners of en : basic level, Samuela Eckstut. . : New York, Addison Wesley Longman, 1996. Text.