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Rujukan WikiPedia: Sastera kelabu http://apo.org.au/research/where-evidence-realisin... http://www.emeraldinsight.com/journals.htm?issn=14... http://www-cpa.stanford.edu/byform/mailing-lists/e... http://www.cedefop.europa.eu/EN/Files/6115_en.pdf http://www.opengrey.eu http://archivesic.ccsd.cnrs.fr/sic_00168998/fr/ http://www.osti.gov/graylit/ http://www.science.gov/ //doi.org/10.17821%2Fsrels%2F2020%2Fv57i2%2F150546 http://www.greynet.org/
