Roberts, R. (2007). Learn-O-Grams: Pictorial puzzles to warm up, wind down, and energize learning. San Francisco: Wiley.
Citación estilo ChicagoRoberts, Ron. Learn-O-Grams: Pictorial Puzzles to Warm Up, Wind Down, and Energize Learning. San Francisco: Wiley, 2007.
Cita MLARoberts, Ron. Learn-O-Grams: Pictorial Puzzles to Warm Up, Wind Down, and Energize Learning. San Francisco: Wiley, 2007.
Cảnh báo: Các trích dẫn này có thể không phải lúc nào cũng chính xác 100%.