لاکهید اس‌آر-۷۱ بلک‌برد (Persian Wikipedia)

Analysis of information sources in references of the Wikipedia article "لاکهید اس‌آر-۷۱ بلک‌برد" in Persian language version.

refsWebsite

Global rank Persian rank

1smithsonianmag.com

503^rd place

815^th place

low place

5,443^rd place

smithsonianmag.com

Edwards, Owen (July 2009). "The Ultimate Spy Plane". Smithsonian Magazine. Retrieved 27 November 2017. The 32 Blackbirds cost an average of $34 million each.

sr-71.org

Lockheed SR-71 Blackbird page. sr-71.org.