Cita APA (7a ed.)

Read, C., & Matthews, A. (1991). Tandem plus. [s.n].

Cita Chicago Style (17a ed.)

Read, Carol, y Alan Matthews. Tandem Plus. NelSon, U.K: [s.n], 1991.

Cita MLA (9a ed.)

Read, Carol, y Alan Matthews. Tandem Plus. [s.n], 1991.