Gaya APA

al., E. et al (1993,1996,1994). Dasar-dasar Ekologi (Ed. 3). Yogyakarta: Gadjah Mada University Press.

Gaya MLA

al., Et. et al. "Dasar-dasar Ekologi". Ed. 3 Yogyakarta: Gadjah Mada University Press, 1993,1996,1994. Text.