Martinez Sanchez, Rafael M; et al. (2018). "The middle neolithic of Morocco's north-western Atlantic strip: New evidence from the El-Khil caves (Tangier)". African Archaeological Review. 35 (3): 417-442. doi:10.1007/s10437-018-9310-6. S2CID165440787.
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Martinez Sanchez, Rafael M; et al. (2018). "The middle neolithic of Morocco's north-western Atlantic strip: New evidence from the El-Khil caves (Tangier)". African Archaeological Review. 35 (3): 417-442. doi:10.1007/s10437-018-9310-6. S2CID165440787.