diff --git a/src/core/article.cpp b/src/core/article.cpp
index 4ba0b33..5d046ff 100644
--- a/src/core/article.cpp
+++ b/src/core/article.cpp
@@ -1,24 +1,15 @@
 #include "article.h"
 
-Article::Article() : Entity()
-{}
+Article::Article() : Entity() {}
 
-Article::Article(const std::shared_ptr<Seller> sellerPtr) : Entity()
-{
-    this->sellerPtr = sellerPtr;
-}
+Article::Article(std::shared_ptr<Seller> sellerPtr) : Entity() { sellerPtr_ = sellerPtr; }
 
-void Article::setArticleNo(int articleNo)
-{
-    this->articleNo = articleNo;
-}
+void Article::setArticleNo(int articleNo) { articleNo_ = articleNo; }
 
-void Article::setPrice(int price)
-{
-    this->price = price;
-}
+void Article::setPrice(int price) { price_ = price; }
 
-void Article::setDescription(const std::string& description)
-{
-    this->description = description;
-}
\ No newline at end of file
+void Article::setDescription(const std::string& description) { description_ = description; }
+
+void Article::setSale(const std::shared_ptr<Sale> salePtr) { salePtr_ = salePtr; }
+
+bool Article::isSold() { return salePtr_ ? true : false; }
\ No newline at end of file
diff --git a/src/core/article.h b/src/core/article.h
index cc25ffa..dd93e89 100644
--- a/src/core/article.h
+++ b/src/core/article.h
@@ -3,6 +3,7 @@
 
 #include "entity.h"
 #include "seller.h"
+#include "sale.h"
 
 #include <string>
 #include <memory>
@@ -17,11 +18,15 @@ public:
     void setArticleNo(int articleNo);
     void setPrice(int price);
     void setDescription(const std::string& description);
+    bool isSold();
+    void setSale(const std::shared_ptr<Sale> salePtr);
+    void setSeller(std::shared_ptr<Seller> sellerPtr);
 private:
-    std::shared_ptr<Seller> sellerPtr{};
-    int articleNo{};
-    int price{};
-    std::string description{};
+    std::shared_ptr<Seller> sellerPtr_{};
+    std::shared_ptr<Sale> salePtr_{};
+    int articleNo_{};
+    int price_{};
+    std::string description_{};
 };
 
 #endif
\ No newline at end of file