Gaya APA

Wuryaningrum, R, S. et al (2008). Perspective: English for Economics ( Reading, Writing and Grammar) (cet. 1). Sidoarjo: Laras.

Gaya MLA

Wuryaningrum, Rica, S.. et al. "Perspective: English for Economics ( Reading, Writing and Grammar)". cet. 1 Sidoarjo: Laras, 2008. Text.