Gaya APA

Underhill, N. (1987). Testing spoken language : a handbook of oral testing techniques (8 th ed.). Sebastopol, CA: Effendiharahap Publishing Coy.

Gaya MLA

Underhill, Nic. "Testing spoken language : a handbook of oral testing techniques". 8 th ed. Sebastopol, CA: Effendiharahap Publishing Coy, 1987. Text.