Παραπομπή σε μορφή APA (7η εκδ.)

Williams, E., & Shuard, H. (1994). Primary mathematics today: Towards the 21st century (4th ed.). Longman.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Williams, Elizabeth, και Hilary Shuard. Primary Mathematics Today: Towards the 21st Century. 4th ed. Essex: Longman, 1994.

Παραπομπή σε μορφή MLA (9th εκδ.)

Williams, Elizabeth, και Hilary Shuard. Primary Mathematics Today: Towards the 21st Century. 4th ed. Longman, 1994.