Gaya APA

E.Heeren, C, D, &, V. (1986). Guide to Clast Mathematical Competency to Acccompany . American: Foresman and Company.

Gaya MLA

E.Heeren, Charles, D.Miller, &, Vern. "Guide to Clast Mathematical Competency to Acccompany". American: Foresman and Company, 1986. Text.