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Roberts K (октобар 1994). „The plant extracellular matrix: in a new expansive mood”. Current Opinion in Cell Biology. 6 (5): 688—94. PMID7833049. doi:10.1016/0955-0674(89)90074-4.CS1 одржавање: Формат датума (веза)
Hogan CM (2010). „Abiotic factor”. Ур.: Monosson E, Cleveland C. Encyclopedia of Earth. Washington DC: National Council for Science and the Environment. Архивирано из оригинала 2013-06-08. г.
Roberts K (октобар 1994). „The plant extracellular matrix: in a new expansive mood”. Current Opinion in Cell Biology. 6 (5): 688—94. PMID7833049. doi:10.1016/0955-0674(89)90074-4.CS1 одржавање: Формат датума (веза)
Hogan CM (2010). „Abiotic factor”. Ур.: Monosson E, Cleveland C. Encyclopedia of Earth. Washington DC: National Council for Science and the Environment. Архивирано из оригинала 2013-06-08. г.