Gaya APA

Clarkson, D, R., Hansen, R, S. (1964). Understanding today s mathematics. (1964). : Hamden : The Shoe String Press, Inc.,.

Gaya MLA

Clarkson, Donald, R.., Hansen, Robert, S.. "Understanding today s mathematics.". 1964 : Hamden : The Shoe String Press, Inc.,, 1964. Text.