Cita APA (7a ed.)

Cooper, R. (1991). ABC: The right approach for you? [s.n.].

Cita Chicago Style (17a ed.)

Cooper, Robin. ABC: The Right Approach for You? [S.l.]: [s.n.], 1991.

Cita MLA (9a ed.)

Cooper, Robin. ABC: The Right Approach for You? [s.n.], 1991.