»AAAAA Scenic Areas«. China National Tourism Administration. 16. november 2008. Arhivirano iz prvotnega spletišča dne 4. aprila 2014. Pridobljeno 9. aprila 2011.
doi.org
Salmon, Lynn G.; Christoforou, Christos S.; Cass, Glen R. (1994). »Airborne Pollutants in the Buddhist Cave Temples at the Yungang Grottoes, China«. Environmental Science & Technology (v angleščini). 28 (5): 805–811. Bibcode:1994EnST...28..805S. doi:10.1021/es00054a010. PMID22191820.
Salmon, Lynn G.; Christoforou, Christos S.; Cass, Glen R. (1994). »Airborne Pollutants in the Buddhist Cave Temples at the Yungang Grottoes, China«. Environmental Science & Technology (v angleščini). 28 (5): 805–811. Bibcode:1994EnST...28..805S. doi:10.1021/es00054a010. PMID22191820.
harvard.edu
ui.adsabs.harvard.edu
Salmon, Lynn G.; Christoforou, Christos S.; Cass, Glen R. (1994). »Airborne Pollutants in the Buddhist Cave Temples at the Yungang Grottoes, China«. Environmental Science & Technology (v angleščini). 28 (5): 805–811. Bibcode:1994EnST...28..805S. doi:10.1021/es00054a010. PMID22191820.
Salmon, Lynn G.; Christoforou, Christos S.; Cass, Glen R. (1994). »Airborne Pollutants in the Buddhist Cave Temples at the Yungang Grottoes, China«. Environmental Science & Technology (v angleščini). 28 (5): 805–811. Bibcode:1994EnST...28..805S. doi:10.1021/es00054a010. PMID22191820.
megalithic.co.uk
[1]Silk Road, North China, C.Michael Hogan, the Megalithic Portal, ur. A. Burnham, 2007].
nih.gov
pubmed.ncbi.nlm.nih.gov
Salmon, Lynn G.; Christoforou, Christos S.; Cass, Glen R. (1994). »Airborne Pollutants in the Buddhist Cave Temples at the Yungang Grottoes, China«. Environmental Science & Technology (v angleščini). 28 (5): 805–811. Bibcode:1994EnST...28..805S. doi:10.1021/es00054a010. PMID22191820.
Salmon, Lynn G.; Christoforou, Christos S.; Cass, Glen R. (1994). »Airborne Pollutants in the Buddhist Cave Temples at the Yungang Grottoes, China«. Environmental Science & Technology (v angleščini). 28 (5): 805–811. Bibcode:1994EnST...28..805S. doi:10.1021/es00054a010. PMID22191820.
»AAAAA Scenic Areas«. China National Tourism Administration. 16. november 2008. Arhivirano iz prvotnega spletišča dne 4. aprila 2014. Pridobljeno 9. aprila 2011.