Cita APA (7th ed.)

Barker, J. A. (1969). A formal analysis of conditionals. Southern Illinois University.

Cita Chicago (17th ed.)

Barker, John A. A Formal Analysis of Conditionals. [Carbondale]: Southern Illinois University, 1969.

Cita MLA (9th ed.)

Barker, John A. A Formal Analysis of Conditionals. Southern Illinois University, 1969.