Cita APA (7th ed.)

Johnston, C. (1987). Developmental mathematics (2nd ed.). Wadsworth.

Cita Chicago (17th ed.)

Johnston, C.L. Developmental Mathematics. 2nd ed. Belmont, Calif: Wadsworth, 1987.

Cita MLA (9th ed.)

Johnston, C.L. Developmental Mathematics. 2nd ed. Wadsworth, 1987.