APA
hopkins d. p., .chemicals,humans,and the soil,a simple persentation of contemporary knowledge and opinize hopkins,donald percy. 1st ed. | London Faber: .
Chicago
hopkins donald persy,1909, .chemicals,humans,and the soil,a simple persentation of contemporary knowledge and opinize hopkins,donald percy. 1st ed. | London Faber: .
Harvard
hopkins d. p., .chemicals,humans,and the soil,a simple persentation of contemporary knowledge and opinize hopkins,donald percy. 1st ed. | London Faber: .
MLA
hopkins donald persy,1909, .1st ed. | London Faber: . .