Food and Agriculture Organization of the United Nations. (1979). China: Azolla propagation and small-scale biogas technology. FAO.
Chicago-referens (17:e uppl.)Food and Agriculture Organization of the United Nations. China: Azolla Propagation and Small-scale Biogas Technology. Rome: FAO, 1979.
MLA-referens (9:e uppl.)Food and Agriculture Organization of the United Nations. China: Azolla Propagation and Small-scale Biogas Technology. FAO, 1979.
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