Gilde, W. (1978). Erfinden, was noch niemals war. Urania Verlag.
Citazione stile Chigago Style (17a edizione)Gilde, Werner. Erfinden, Was Noch Niemals War. Leipzig: Urania Verlag, 1978.
Citatione MLA (8a ed.)Gilde, Werner. Erfinden, Was Noch Niemals War. Urania Verlag, 1978.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.