diff --git a/inventory/models.py b/inventory/models.py
index 57c4eac..64b604d 100644
--- a/inventory/models.py
+++ b/inventory/models.py
@@ -13,6 +13,8 @@ class Warehouse(models.Model):
     address = models.TextField()
     have_freeze = models.BooleanField()
 
+    def __str__(self):
+        return f"{self.name}"
 
 class Inventory(models.Model):
     """
@@ -28,6 +30,13 @@ class Inventory(models.Model):
     min_stock = models.IntegerField()
     current_stock = models.IntegerField()
 
+    @property
+    def stock_percentage(self):
+        return self.current_stock / self.max_stock * 100
+
+    def __str__(self):
+        return f"{self.warehouse.name} - {self.stock_percentage}%"
+
     class Meta:
         verbose_name_plural = 'Inventories'
 
@@ -48,4 +57,7 @@ class Item(models.Model):
     description = models.TextField()
     category = models.CharField(max_length=255)
     weight = models.DecimalField(max_digits=10, decimal_places=3)
-    quantity = models.IntegerField()
\ No newline at end of file
+    quantity = models.IntegerField()
+
+    def __str__(self):
+        return f"{self.name} - {self.quantity}"
\ No newline at end of file
diff --git a/transaction/models.py b/transaction/models.py
index 6c7ffc5..27cf510 100644
--- a/transaction/models.py
+++ b/transaction/models.py
@@ -12,6 +12,8 @@ class Supplier(models.Model):
     name = models.CharField(max_length=255)
     address = models.TextField()
 
+    def __str__(self):
+        return f"{self.name} - {self.address}"
 
 class Supply(models.Model):
     """
@@ -27,6 +29,9 @@ class Supply(models.Model):
     quantity = models.IntegerField()
     arrive_date = models.DateField()
 
+    def __str__(self):
+        return f"{self.supplier.name} - {self.item.name} - {self.quantity}"
+
     class Meta:
         verbose_name_plural = 'Supplies'
 
@@ -41,6 +46,8 @@ class Customer(models.Model):
     name = models.CharField(max_length=255)
     address = models.TextField()
 
+    def __str__(self):
+        return f"{self.name} - {self.address}"
 
 class Order(models.Model):
     """
@@ -56,6 +63,8 @@ class Order(models.Model):
     order_date = models.DateField()
     quantity = models.IntegerField()
 
+    def __str__(self):
+        return f"{self.customer.name} - {self.item.name} - {self.quantity}"
 
 class Transfer(models.Model):
     """
@@ -73,4 +82,7 @@ class Transfer(models.Model):
     item = models.ForeignKey(Item, on_delete=models.CASCADE)
     quantity = models.IntegerField()
     from_date_timestamp = models.DateTimeField()
-    to_date_timestamp = models.DateTimeField()
\ No newline at end of file
+    to_date_timestamp = models.DateTimeField()
+
+    def __str__(self):
+        return f"{self.from_warehouse.name} - {self.to_warehouse.name} - {self.item.name} - {self.quantity}"
\ No newline at end of file