Citazione Stile APA (7a Edizione)

Billstein, R. (1987). A problem solving approach to mathematics for elementary school teachers (3rd ed.). Benjamin/Cummings.

Citazione stile Chigago Style (17a edizione)

Billstein, Rick. A Problem Solving Approach to Mathematics for Elementary School Teachers. 3rd ed. Menlo Park, Calif: Benjamin/Cummings, 1987.

Citatione MLA (9a ed.)

Billstein, Rick. A Problem Solving Approach to Mathematics for Elementary School Teachers. 3rd ed. Benjamin/Cummings, 1987.