Sponsel, H. (1959). Nautilus: Heinz Sponsel. Lux.
Cita Chicago (17th ed.)Sponsel, Heinz. Nautilus: Heinz Sponsel. Murnau [u.a.]: Lux, 1959.
Cita MLA (8th ed.)Sponsel, Heinz. Nautilus: Heinz Sponsel. Lux, 1959.
Atenció: Aquestes cites poden no estar 100% correctes.