APA

Emerich D. W., Krishnan H. B., . (2009). Nitrogen Fixation in Crop Production / David W. Emerich, Hari B. Krishnan. Madison: American Society of Agronomy; Crop Science Society of America; Soil Science Society of America.

Chicago

Emerich David W, Krishnan Hari B, . 2009. Nitrogen Fixation in Crop Production / David W. Emerich, Hari B. Krishnan. Madison: American Society of Agronomy; Crop Science Society of America; Soil Science Society of America.

Harvard

Emerich D. W., Krishnan H. B., . (2009). Nitrogen Fixation in Crop Production / David W. Emerich, Hari B. Krishnan. Madison: American Society of Agronomy; Crop Science Society of America; Soil Science Society of America.

MLA

Emerich David W, Krishnan Hari B, . Nitrogen Fixation in Crop Production / David W. Emerich, Hari B. Krishnan. Madison: American Society of Agronomy; Crop Science Society of America; Soil Science Society of America. 2009.