Παραπομπή σε μορφή APA (7η εκδ.)

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

Παραπομπή σε μορφή Chicago (17η εκδ.)

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

Παραπομπή σε μορφή MLA (9th εκδ.)

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