Gaya APA

Callahan, J, F., H, I, C, L. (NULL). Teaching in the middle and secondary schools planning for competence . New: New York: Macmillan; 1982.

Gaya MLA

Callahan, Joseph, F., H, I., Clark,, Leonard. "Teaching in the middle and secondary schools planning for competence". New: New York: Macmillan; 1982, NULL. Text.