Cita APA (7a ed.)

Rivas López, J. A. (1970). Learning English. Book one. Bello.

Cita Chicago Style (17a ed.)

Rivas López, Juan Antonio. Learning English. Book One. Valencia: Bello, 1970.

Cita MLA (9a ed.)

Rivas López, Juan Antonio. Learning English. Book One. Bello, 1970.