Gaya APA

Chacko, E. et al (2014). Essentials Of World Regional Geogeaphy (-). Palangkaraya: McGRAW HILL _2.

Gaya MLA

Chacko, Elizabeth. et al. "Essentials Of World Regional Geogeaphy". - Palangkaraya: McGRAW HILL _2, 2014. Buku Teks.