Gaya APA

(ETS), E, T, S. (2010). Toefl Itp Assessment Series Vol.1 : Practice Tests (Vol. 1). Jakarta: Erlangga.

Gaya MLA

(ETS), Educational, Testing, Service. "Toefl Itp Assessment Series Vol.1 : Practice Tests". Vol. 1 Jakarta: Erlangga, 2010. Text.