Gaya APA

al., E. et al (1990,1995). Dasar-dasar Hidrologi (-). Yogyakarta: Gadjah Mada University Press.

Gaya MLA

al., Et. et al. "Dasar-dasar Hidrologi". - Yogyakarta: Gadjah Mada University Press, 1990,1995. Text.