Gaya APA
PURWANTANA, B. (2011).
Kajian input energi pD budidaya padi metode system of rice insentification : .
Yogyakarta:
Fak. Pertanian-UGM.
Gaya MLA
PURWANTANA, Bambang.
"Kajian input energi pD budidaya padi metode system of rice insentification :".
Yogyakarta:
Fak. Pertanian-UGM,
2011.
Artikel.