APA

Nelson D. M., Hu F. S., Tian J., Stefanova I. & Brown T. A. (20040302). Response of C3 and C4 plants to middle-Holocene climatic variation near the prairie-forest ecotone of Minnesota. : Proceedings of the National Academy of Sciences of the United States of America.

Chicago

Nelson David M, Hu Feng Sheng, Tian Jian, Stefanova Ivanka and Brown Thomas A. 20040302. Response of C3 and C4 plants to middle-Holocene climatic variation near the prairie-forest ecotone of Minnesota. : Proceedings of the National Academy of Sciences of the United States of America.

Harvard

Nelson D. M., Hu F. S., Tian J., Stefanova I. and Brown T. A. (20040302). Response of C3 and C4 plants to middle-Holocene climatic variation near the prairie-forest ecotone of Minnesota. : Proceedings of the National Academy of Sciences of the United States of America.

MLA

Nelson David M, Hu Feng Sheng, Tian Jian, Stefanova Ivanka and Brown Thomas A. Response of C3 and C4 plants to middle-Holocene climatic variation near the prairie-forest ecotone of Minnesota. : Proceedings of the National Academy of Sciences of the United States of America. 20040302.