Guthrie, F. B., & Cohen, L. (1909). Note on the occurrence of manganese in soil and its effect on grass. Zenodo.
Cita Chicago (17th ed.)Guthrie, Frederick Bickell, i Lionel Cohen. Note on the Occurrence of Manganese in Soil and Its Effect on Grass. Zenodo, 1909.
Cita MLA (9th ed.)Guthrie, Frederick Bickell, i Lionel Cohen. Note on the Occurrence of Manganese in Soil and Its Effect on Grass. Zenodo, 1909.
Atenció: Aquestes cites poden no estar 100% correctes.