APA (7e ed.) Bronvermelding

Hardgrove, C. E., & Miller, H. F. (1968). Mathematics library: Elementary and junior high school (2nd ed.). National Council of Teachers of Mathematics.

Chicago (17e ed.) Bronvermelding

Hardgrove, Clarence Ethel, en Herbert Francis Miller. Mathematics Library: Elementary and Junior High School. 2nd ed. Washington: National Council of Teachers of Mathematics, 1968.

MLA (8e ed.) Bronvermelding

Hardgrove, Clarence Ethel, en Herbert Francis Miller. Mathematics Library: Elementary and Junior High School. 2nd ed. National Council of Teachers of Mathematics, 1968.