Gaya APA
Sastroutomo, S, S.
(1990).
Ekologi gulma
(
1st ed)
.
Jakarta:
Gramedia Pustaka Utama.
Gaya MLA
Sastroutomo, Soetikno, S..
"Ekologi gulma".
1st ed
Jakarta:
Gramedia Pustaka Utama,
1990.
Printed Book.