APA
Cowles G., . (2016). Agricultural Chemical Users Manual. : United Book Prints.
Chicago
Cowles Geoff, . 2016. Agricultural Chemical Users Manual. : United Book Prints.
Harvard
Cowles G., . (2016). Agricultural Chemical Users Manual. : United Book Prints.
MLA
Cowles Geoff, . Agricultural Chemical Users Manual. : United Book Prints. 2016.