Cita APA (7th ed.)

Southern, R. W., & Southern, R. W. (2002). Foundations. Blackwell.

Cita Chicago (17th ed.)

Southern, Richard W., i Richard W. Southern. Foundations. Oxford [u.a.]: Blackwell, 2002.

Cita MLA (8th ed.)

Southern, Richard W., i Richard W. Southern. Foundations. Blackwell, 2002.