}}</ref> This is an often-stated{{weasel word|date=February 2023}} principle of OOP,suchis asdiscussed in the influential{{weasel word|date=February 2023}} book ''[[Design Patterns]]'' (1994).<ref>{{Cite book | isbn = 0-201-63361-2 | title = [[Design Patterns|Design Patterns: Elements of Reusable Object-Oriented Software]] | last1 = Gamma | first1 = Erich | authorlink1 = Erich Gamma | last2 = Helm | first2 = Richard | last3 = Johnson | first3 = Ralph | authorlink3 = Ralph Johnson (computer scientist) | last4 = Vlissides | first4 = John | authorlink4 = John Vlissides | year = 1994 | publisher = [[Addison-Wesley]] | page = [https://archive.org/details/designpatternsel00gamm/page/20 20] | oclc = 31171684 }}
