Gaya APA

Bosstick, M., Cable, J, L. (1975). Patterns in the sand : an exploration in mathematics (2 nd ed.). Baverly Hills, Callif: Benziger Bruce & Glencoe,.

Gaya MLA

Bosstick, Maurice., Cable, John, L.. "Patterns in the sand : an exploration in mathematics". 2 nd ed. Baverly Hills, Callif: Benziger Bruce & Glencoe,, 1975. Text.