APA Citation

Gunn, C. R. Families and genera of spermatophytes recognized by the agricultural research service. [y.y.]: United States Deparment of Agriculture.

Chicago Style Citation

Gunn, Charles R. Families and Genera of Spermatophytes Recognized By the Agricultural Research Service. [y.y.]: United States Deparment of Agriculture.

MLA Citation

Gunn, Charles R. Families and Genera of Spermatophytes Recognized By the Agricultural Research Service. [y.y.]: United States Deparment of Agriculture.

Warning: These citations may not always be 100% accurate.