Null object pattern: Difference between revisions

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Bluelinking 1 books for verifiability.) #IABot (v2.1alpha3
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| publisher = Addison-Wesley
| isbn = 0-201-48567-2
| url-access = registration
}}</ref> and Joshua Kerievsky's Refactoring To Patterns<ref>{{cite book
| url = https://archive.org/details/isbn_9780201485677
}}</ref> and Joshua Kerievsky's Refactoring To Patterns<ref>{{cite book
| first = Joshua
| last = Kerievsky