Harper، J. L.؛ Benton، R. A. (1 يناير 1966). "The Behaviour of Seeds in Soil: II. The Germination of Seeds on the Surface of a Water Supplying Substrate". Journal of Ecology. ج. 54 ع. 1: 151–166. DOI:10.2307/2257664. JSTOR:2257664.
Harper، J. L.؛ Benton، R. A. (1 يناير 1966). "The Behaviour of Seeds in Soil: II. The Germination of Seeds on the Surface of a Water Supplying Substrate". Journal of Ecology. ج. 54 ع. 1: 151–166. DOI:10.2307/2257664. JSTOR:2257664.