Cita APA (7a ed.)

Pen, J., & Preston, T. (1966). Harmony and conflict in modern society. McGraw-Hill.

Cita Chicago Style (17a ed.)

Pen, Jan, y Trevor Preston. Harmony and Conflict in Modern Society. London: McGraw-Hill, 1966.

Cita MLA (9a ed.)

Pen, Jan, y Trevor Preston. Harmony and Conflict in Modern Society. McGraw-Hill, 1966.