Cita APA (7th ed.)
Skinner, T. (1968). Black and free. Zondervan Publishing House.
Cita Chicago (17th ed.)
Skinner, Tom. Black and Free. Michigan: Zondervan Publishing House, 1968.
Cita MLA (9th ed.)
Skinner, Tom. Black and Free. Zondervan Publishing House, 1968.
Atenció: Aquestes cites poden no estar 100% correctes.