Gaya APA

Sumardi, ., Widyastuti, S. (2004). Dasar-dasar perlindungan hutan (cet. 1). Yogyakarta: Gadjah Mada University Press.

Gaya MLA

Sumardi, ., Widyastuti, S.M. "Dasar-dasar perlindungan hutan". cet. 1 Yogyakarta: Gadjah Mada University Press, 2004. ML.