Peters, F. (1950). The world next door. Gollancz.
Cita Chicago (17th ed.)Peters, Fritz. The World Next Door. London: Gollancz, 1950.
Cita MLA (8th ed.)Peters, Fritz. The World Next Door. Gollancz, 1950.
Atenció: Aquestes cites poden no estar 100% correctes.