Citazione Stile APA (7a Edizione)

Baird, S. W. (1900). Graded work in arithmetic. Fourth book, intermediate grades. American Book Co.

Citazione stile Chigago Style (17a edizione)

Baird, S. W. Graded Work in Arithmetic. Fourth Book, Intermediate Grades. Nuew York-Cincinnati- Chicago: American Book Co, 1900.

Citatione MLA (9a ed.)

Baird, S. W. Graded Work in Arithmetic. Fourth Book, Intermediate Grades. American Book Co, 1900.