Editing Greatest common divisor (section)

== References ==
{{refbegin}}
* {{cite book |last=Andrews |first=George E. |author-link=George Andrews (mathematician) |year=1994 |orig-year=1971 |title=Number Theory |publisher=Dover |isbn=978-0-486-68252-5 |url=https://books.google.com/books?id=eVwvvwZeBf4C }}
* {{cite book
  | last1 = Hardy  | first1 = G. H. | author1-link = G. H. Hardy
  | last2 = Wright | first2 = E. M. | author2-link = E. M. Wright
  | title = [[An Introduction to the Theory of Numbers]]
  | edition = Fifth
  | publisher = [[Oxford University Press]]
  | location = Oxford
  | year = 1979
  | isbn = 978-0-19-853171-5}}
* {{cite book | first = Calvin T. | last = Long | year = 1972 | title = Elementary Introduction to Number Theory | edition = 2nd | publisher = [[D. C. Heath and Company]] | location = Lexington | lccn = 77171950 }}
* {{cite book | first1 = Anthony J. | last1 = Pettofrezzo | first2 = Donald R. | last2 = Byrkit | year = 1970 | title = Elements of Number Theory | publisher = [[Prentice Hall]] | location = Englewood Cliffs | lccn = 71081766}}
{{refend}}