Sheldon, E. A. (1883). Lessons on objects, graduated series: Designed for children between the ages of six and fourteen years.
Chicago-Zitierstil (17. Ausg.)Sheldon, Edward Austin. Lessons on Objects, Graduated Series: Designed for Children Between the Ages of Six and Fourteen Years. New York, 1883.
MLA-Zitierstil (9. Ausg.)Sheldon, Edward Austin. Lessons on Objects, Graduated Series: Designed for Children Between the Ages of Six and Fourteen Years. 1883.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.