APA (7e ed.) Bronvermelding

Hopkins, C. G. The Story of the Soil; from the Basis of Absolute Science and Real Life.

Chicago (17e ed.) Bronvermelding

Hopkins, Cyril G. The Story of the Soil; from the Basis of Absolute Science and Real Life.

MLA (9e ed.) Bronvermelding

Hopkins, Cyril G. The Story of the Soil; from the Basis of Absolute Science and Real Life.

Let op: Deze citaties zijn niet altijd 100% accuraat.