Cita APA (7th ed.)

Abbott, G. W. (1969). Conditionals (1a. ed.). Longmans, Green and Co.

Cita Chicago (17th ed.)

Abbott, G. W. Conditionals. 1a. ed. Londres: Longmans, Green and Co, 1969.

Cita MLA (9th ed.)

Abbott, G. W. Conditionals. 1a. ed. Longmans, Green and Co, 1969.