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MLA

Creel, C. W, and L. P Rockwood. The control of the clover-flower midge. U.S. Dept. of Agriculture, 1918.

APA

Creel, C. W, and Rockwood, L. P. (1918). The control of the clover-flower midge. U.S. Dept. of Agriculture.

Chicago

Creel, C. W., and L. P Rockwood. The control of the clover-flower midge. U.S. Dept. of Agriculture, 1918.