④参见中国农业百科全书总编辑委员会生物学卷编辑委员会、中国农业百科全书编辑部编：《中国农业百科全书·生物学卷》，北京：农业出版社，1991年，第237-238页；Britannica:Academic Edition,http://www.britannica.com/EBchecked/topic/203664/feed,2012-04-11.
    ⑤参见Britannica:Academic Edition,http://www.britannica.com/EBchecked/topic/27751/antibiotic,2012-04-11.
    原文参考文献：
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