Gaya APA

O'Daffer, P, G., Clemens, S, R. (1991). Geometry : an investigative approach (2nd ed). New York: Addison-Wesley.

Gaya MLA

O'Daffer, Phares, G.., Clemens, Stanley, R.. "Geometry : an investigative approach". 2nd ed New York: Addison-Wesley, 1991. Text.