Gaya APA

Lumpkin, T, , A., Plucknet, D, , L. (1982). azolla as a green manure : use and management in crop production . Colorado: Westview Press.

Gaya MLA

Lumpkin, Thomas, , A.., Plucknet, Donald, , L.. "azolla as a green manure : use and management in crop production". Colorado: Westview Press, 1982. Text.