The rate of plant food absorbtion and its relation to fertilizers and fertilizer practice.
APA Citation
E.I. du Pont de Nemours & Company. (1939). The rate of plant food absorbtion and its relation to fertilizers and fertilizer practice. Wilmington, Del.: The author.
MLA Citation
E.I. du Pont de Nemours & Company. The Rate of Plant Food Absorbtion And Its Relation to Fertilizers And Fertilizer Practice. Wilmington, Del.: The author, 1939.
Warning: These citations may not always be complete (especially for serials).