Cita APA (7a ed.)

Gregson, J. M. (2014). A necessary end (First world edition.). Severn House.

Cita Chicago Style (17a ed.)

Gregson, J. M. A Necessary End. First world edition. Sutton: Severn House, 2014.

Cita MLA (8a ed.)

Gregson, J. M. A Necessary End. First world edition. Severn House, 2014.

Precaución: Estas citas no son 100% exactas.