Gaya APA

Sumardi, ., Widyastuti, S, M. (2007). Dasar-dasar perlindungan hutan (Cet.2). Yogyakarta: Gadjah Mada University Press.

Gaya MLA

Sumardi, ., Widyastuti, S., M.. "Dasar-dasar perlindungan hutan". Cet.2 Yogyakarta: Gadjah Mada University Press, 2007. Monograft.