Washington (CNN)Potential Republican presidential hopeful Ben Carson is apologizing after being accused of plagiarism -- even as the author of one of the books Carson is accused of lifting material from is rushing to his defense. 

"I attempted to appropriately cite and acknowledge all sources in America the Beautiful, but inadvertently missed some. I apologize, and I am working with my editors to rectify the situation," Carson said in a statement his representative, Armstrong Williams, provided to CNN. 

BuzzFeed News broke the story earlier this week that Carson had lifted material from a number of books and online sources for his 2012 book "America the Beautiful." 

Among those sources is SocialismSucks.net, a site whose founder acknowledged to BuzzFeed that Carson had taken some of his comments. Other sources included "The Five Thousand Year Leap" by W. Cleon Skousen, a Liberty Institute press release, CBS News and author William Federer's book "America's God and Country." 

Carson, a neurosurgeon who's said he'll make a decision on a 2016 bid by this spring, is the latest GOP presidential contender to be hit with plagiarism charges. Sen. Rand Paul (R-Ky.) faced similar accusations about his own book in 2013. 

The plagiarism charges have "blindsided" Carson, a source close to the neurosurgeon reportedly told the National Review Online. 

"Alongside the author, we too take these matters very seriously. We have been in contact with the author and agent and will work with them to review the given information. We will respond as appropriate," a spokesperson for HarperCollins Christian publishing, which published Carson's book, told BuzzFeed.  QUESTIONS:

Q1:
1. Why was Ben Carson issuing an apology?
2. What was Ben Carson sorry about?
3. 
Q2:
1. What was Ben Carson attempting to cite sources for?
2. What was Ben Carson trying to give credit to the appropriate sources for?
3. 
Q3:
1. Who broke the story of Ben Carson's plagiarism?
2. What news outlet revealed plagiarism allegations against Ben Carson?
3. 
Q4:
1. Did any of the authors of the books Ben Carson is accused of plagiarizing come to his defense?
2. Has Ben Carson been defended by anyone that he is accused of plagiarizing?
3. 
Q5:
1. What Kentucky senator has plagiarism charges against him from 2013?
2. In 2013, which senator from Kentucky is accused of plagiarizing his book?
3. 
Q6:
1. What did Ben Carson do before getting into politics?
2. How was Ben Carson employed before becoming a politician?
3. 
Q7:
1. Has Ben Carson been accused of plagiarizing from multiple sources?
2. Is it being alleged that Ben Carson plagiarized from more than one source?
3. 
Q8:
1. What's one source that Ben Carson seems to have copied from?
2. What is one of the sources that Ben Carson is accused of plagiarizing from?
3. 
Q9:
1. What representative gave CNN a statement on behalf of Ben Carson?
2. What was the name of the person that spoke to CNN as a representative for Ben Carson?
3. 
Q10:
1. What US office did Ben Carson wish to run for?
2. What in the United States was Ben Carson wanting to put himself in the running for?
3. 
