Cita APA (7th ed.)

Williams, E. M., & Shuard, H. (1970). Primary mathematics today. Longmans.

Cita Chicago (17th ed.)

Williams, Elizabeth M., i Hilary Shuard. Primary Mathematics Today. Harlow: Longmans, 1970.

Cita MLA (9th ed.)

Williams, Elizabeth M., i Hilary Shuard. Primary Mathematics Today. Longmans, 1970.