Cita APA (7th ed.)

(1991). Fundament - Firmament: Maria Eichhorn, Andreas Ginkel, Ulrich Kühn, Georg Zey.

Cita Chicago (17th ed.)

Fundament - Firmament: Maria Eichhorn, Andreas Ginkel, Ulrich Kühn, Georg Zey. Berlin, 1991.

Cita MLA (8th ed.)

Fundament - Firmament: Maria Eichhorn, Andreas Ginkel, Ulrich Kühn, Georg Zey. 1991.