Cita APA (7a ed.)

Pen, J., & Preston, T. S. (1965). Harmony and conflict in modern society. McGraw-Hill.

Cita Chicago Style (17a ed.)

Pen, Jan, y Trevor S. Preston. Harmony and Conflict in Modern Society. London: McGraw-Hill, 1965.

Cita MLA (8a ed.)

Pen, Jan, y Trevor S. Preston. Harmony and Conflict in Modern Society. McGraw-Hill, 1965.