@book{89392,
	author = {Perusahaan Perkebunan Karet Negara.},
	title = {Risalah-risalah penelitian, 1966.},
	publisher = {Badan Pimpinan Umum Perusahaan Perkebunan Karet Negara},
	year = {[1967]},
	address = {Djakarta,},
	note = {Cover title.}
}