APA (7e ed.) Bronvermelding
Billstein, R., Libeskind, S., & Lott, J. W. (1990). A problem solving approach to mathematics for elementary school teachers (4th ed.). Benjamin/Cummings.
Chicago (17e ed.) Bronvermelding
Billstein, Rick, Shlomo Libeskind, en Johnny W. Lott. A Problem Solving Approach to Mathematics for Elementary School Teachers. 4th ed. Redwood City, Calif.: Benjamin/Cummings, 1990.
MLA (9e ed.) Bronvermelding
Billstein, Rick, et al. A Problem Solving Approach to Mathematics for Elementary School Teachers. 4th ed. Benjamin/Cummings, 1990.
Let op: Deze citaties zijn niet altijd 100% accuraat.