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MLA

Cathey, Henry Marcellus, and U.S. Dept. of Agriculture. "Summer Flowering Bulbs." ,

APA

Cathey, H. Marcellus, & U.S. Dept. of Agriculture, U. Dept. of Agriculture. (1978). Summer flowering bulbs.

Chicago

Cathey, Henry Marcellus, and U.S. Dept. of Agriculture. "Summer flowering bulbs" (0000):