Спејс шатл: Разлика помеѓу преработките

}}</ref><ref name="usatoday">[http://www.usatoday.com/news/nation/2003-02-04-shuttle-critics_x.htm USATODAY.com - Critics scrutinize cost of shuttle<!-- Bot generated title -->]</ref><ref name="columbia_hearing">{{цитирана веб страница | url = http://caib.nasa.gov/events/public_hearings/20030423/transcript_am.html | title = Columbia accident investigation board, public hearing |date= 23 април 2003| publisher = [[NASA]]}}</ref>

 

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