Wiggins, G. P. (2011). The understanding by design guide to creating high-quality units. ASCD.
Chicago-Zitierstil (17. Ausg.)Wiggins, Grant P. The Understanding by Design Guide to Creating High-quality Units. Alexandria, Va: ASCD, 2011.
MLA-Zitierstil (9. Ausg.)Wiggins, Grant P. The Understanding by Design Guide to Creating High-quality Units. ASCD, 2011.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.