Cita APA (7th ed.)

Etherton, A. (1968). Objective english tests intermediate level. Longman.

Cita Chicago (17th ed.)

Etherton, A.R.B. Objective English Tests Intermediate Level. London: Longman, 1968.

Cita MLA (9th ed.)

Etherton, A.R.B. Objective English Tests Intermediate Level. Longman, 1968.