Cita APA (7th ed.)

O'Neill, R. (1970). English in situations (1a. ed.). Oxford University.

Cita Chicago (17th ed.)

O'Neill, Robert. English in Situations. 1a. ed. Londres: Oxford University, 1970.

Cita MLA (9th ed.)

O'Neill, Robert. English in Situations. 1a. ed. Oxford University, 1970.