Cita APA (7th ed.)

Porter, D., & Prince, D. (2010). Frommer's London 2011. Wiley.

Cita Chicago (17th ed.)

Porter, Darwin, i Danforth Prince. Frommer's London 2011. Hoboken, N.J: Wiley, 2010.

Cita MLA (9th ed.)

Porter, Darwin, i Danforth Prince. Frommer's London 2011. Wiley, 2010.