Gaya APA
Sumardi, ., Widyastuti, S.
(2007).
Dasar-dasar perlindungan hutan
.
Yogyakarta:
Gadjah Mada University Press.
Gaya MLA
Sumardi, ., Widyastuti, SM..
"Dasar-dasar perlindungan hutan".
Yogyakarta:
Gadjah Mada University Press,
2007.
Text.