Gaya APA

al., E. et al (1991,1986,1995,1994,2010). Dasar-dasar Ilmu Tanah (Ed. 7,Ed. 6,-). Yogyakarta: Gadjah Mada University Press.

Gaya MLA

al., Et. et al. "Dasar-dasar Ilmu Tanah". Ed. 7,Ed. 6,- Yogyakarta: Gadjah Mada University Press, 1991,1986,1995,1994,2010. Text.