Colllings, G. H. (1955). Commercial fertilizers, their sources and use (5th edition.). McGraw-Hill.
Chicago Style (17th ed.) CitationColllings, Gilbeart Hooper. Commercial Fertilizers, Their Sources and Use. 5th edition. New York: McGraw-Hill, 1955.
MLA (9th ed.) CitationColllings, Gilbeart Hooper. Commercial Fertilizers, Their Sources and Use. 5th edition. McGraw-Hill, 1955.
Warning: These citations may not always be 100% accurate.