Schmidt, M; Lucke, B; Bäumler, R; al-Saad, Z; al-Qudah, B; Hutcheon, A (2006). "The Decapolis region (Northern Jordan) as historical example of desertification? Evidence from soil development and distribution". Quaternary International. 151 (1): 74–86. Bibcode:2006QuInt.151...74S. doi:10.1016/j.quaint.2006.01.023.
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Schmidt, M; Lucke, B; Bäumler, R; al-Saad, Z; al-Qudah, B; Hutcheon, A (2006). "The Decapolis region (Northern Jordan) as historical example of desertification? Evidence from soil development and distribution". Quaternary International. 151 (1): 74–86. Bibcode:2006QuInt.151...74S. doi:10.1016/j.quaint.2006.01.023.