Gaya APA

Erosin and Weathering. (2007). : Pelangi.

Gaya Chicago

Erosin and Weathering. . : Pelangi, 2007. Text.

Gaya MLA

Erosin and Weathering. . : Pelangi, 2007. Text.

Gaya Turabian

Erosin and Weathering. : Pelangi, 2007. Print.