PENROSE, B. (1992). Presenting facts and figures: Study notes.-- ed.1. Universitas Terbuka and Depdikbud.
芝加哥风格引文PENROSE, Brenda. Presenting Facts and Figures: Study Notes.-- Ed.1. Jakarta: Universitas Terbuka and Depdikbud, 1992.
MLA引文PENROSE, Brenda. Presenting Facts and Figures: Study Notes.-- Ed.1. Universitas Terbuka and Depdikbud, 1992.
警告：这些引文格式不一定是100％准确.