APA Style

putra, D, S., I.S, S, S. (1994). Focus on Grammar : A High Intermediate Course for Reference and Practice (ed.2) (ke 2). london: Longman.

MLA Style

putra, Drs.Hendra, Setya., I.S, Suprapti, Slamet. "Focus on Grammar : A High Intermediate Course for Reference and Practice (ed.2)". ke 2 london: Longman, 1994. Buku PGSD.