diff --git a/src/main/data/DataSource.java b/src/main/data/DataSource.java
new file mode 100644
index 0000000..3bd9812
--- /dev/null
+++ b/src/main/data/DataSource.java
@@ -0,0 +1,43 @@
+package data;
+
+import java.util.Set;
+import java.util.Map;
+import java.util.HashMap;
+import java.util.Iterator;
+
+public class DataSource {
+    private HashMap<String, StockType> targets;
+    private String name;
+    private String url;
+    private String apiKey;
+    private String defapi;
+
+    public DataSource(String name, String url, String apiKey, String defapi) {
+        this.name = name;
+        this.url = url;
+        this.apiKey = apiKey;
+        this.defapi = defapi;
+    }
+
+    //Effect: add target to this
+    // add this to target if not already done
+    //Modifies: this, stype
+    public void addStype(StockType stype) {
+        String sname = stype.getClass().getName();
+        if (!this.targets.containsKey(sname)) {
+            targets.put(sname,stype);
+            stype.addSource(this);
+        }
+    }
+
+    //Effect: del target to this
+    // del this to target if not already done
+    //Modifies: this, stype
+    public void delStype(StockType stype) {
+        String sname = stype.getClass().getName();
+        if (this.targets.containsKey(sname)) {
+            targets.remove(sname,stype);
+            stype.delSource(this);
+        }
+    }
+}
diff --git a/src/main/data/StockType.java b/src/main/data/StockType.java
index 78b5bbd..2605945 100644
--- a/src/main/data/StockType.java
+++ b/src/main/data/StockType.java
@@ -24,9 +24,46 @@ public abstract class StockType {
         return result;
     }
 
+    //Effects: add source to this
+    // add this to source, if not already added
+    //Modifies: this, source
+    public void addSource(DataSource source) {
+        if (!this.sources.contains(source)) {
+            this.sources.add(source);
+            source.addStype(this);
+        }
+    }
+
+    //Effects: add source to this
+    // add this to source, if not already added
+    //Modifies: this, source
+    public void delSource(DataSource source) {
+        if (this.sources.contains(source)) {
+            this.sources.remove(source);
+            source.delStype(this);
+        }
+    }
+
     //Effects: return name of type
     //Require: working sources
     public String getName() {
         return this.name;
     }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == this) {
+            return true;
+        }
+        if (!(obj instanceof StockType)) {
+            return false;
+        }
+        StockType sobj = (StockType) obj;
+        return this.name.equals(sobj.getName());
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(name);
+    }
 }