Ehm J. Josef. (1977). Praha. Praha, Orbis, 1977.
Cita Chicago (17th ed.)Ehm J. Josef. Praha. Praha, Orbis, 1977, 1977.
Cita MLA (9th ed.)Ehm J. Josef. Praha. Praha, Orbis, 1977, 1977.
Atenció: Aquestes cites poden no estar 100% correctes.
Cita APA (7th ed.)