Delicious Oven Cooked Barbecue Brisket

Ingredients: 

• 5-6 pounds brisket 
• 1 teaspoon celery salt 
• 1 teaspoon garlic powder 
• 1 teaspoon onion salt 
• 2 ounces liquid smoke 
• 1 ounce Worcester Sauce 
• 1 cup prepared Barbecue sauce (your choice)