Connor, J. J., & Shacklette, H. T. (1975). Background geochemistry of some rocks, soils, plants, and vegetables in the conterminous United States: Geochemical summaries for 147 landscape units sampled in 25 fields studies. US Gov. Print. Off.
Chicago-Zitierstil (17. Ausg.)Connor, Jon J., und Hansford T. Shacklette. Background Geochemistry of Some Rocks, Soils, Plants, and Vegetables in the Conterminous United States: Geochemical Summaries for 147 Landscape Units Sampled in 25 Fields Studies. Washington: US Gov. Print. Off, 1975.
MLA-Zitierstil (9. Ausg.)Connor, Jon J., und Hansford T. Shacklette. Background Geochemistry of Some Rocks, Soils, Plants, and Vegetables in the Conterminous United States: Geochemical Summaries for 147 Landscape Units Sampled in 25 Fields Studies. US Gov. Print. Off, 1975.