الشلال (إيشر) (Arabic Wikipedia)

Analysis of information sources in references of the Wikipedia article "الشلال (إيشر)" in Arabic language version.

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doi.org

Penrose، L. S.؛ Penrose، R. (1958). "Impossible objects: A special type of visual illusion". British Journal of Psychology. ج. 49 ع. 1: 31–33. DOI:10.1111/j.2044-8295.1958.tb00634.x. PMID:13536303.

nih.gov

pubmed.ncbi.nlm.nih.gov

Penrose، L. S.؛ Penrose، R. (1958). "Impossible objects: A special type of visual illusion". British Journal of Psychology. ج. 49 ع. 1: 31–33. DOI:10.1111/j.2044-8295.1958.tb00634.x. PMID:13536303.