@book{1131,
	author = {PHEAP, SAMBO},
	title = {Effect of direct seeding mulch-based cropping system on nitrogen content in the soil ឥទ្ទិពលប្រព័ន្ធដាំដុះលើដំណាំគម្របដីលើបរិមាណអាសូតក្នុងដី},
	publisher = {RUA},
	year = {2010},
	address = {Phnom Penh}
}